diff --git a/minidump/minidump_context_writer.h b/minidump/minidump_context_writer.h
index 91e7367..3b50b36 100644
--- a/minidump/minidump_context_writer.h
+++ b/minidump/minidump_context_writer.h
@@ -41,7 +41,7 @@ class MinidumpContextWriter : public internal::MinidumpWritable {
   virtual size_t ContextSize() const = 0;
 
   // MinidumpWritable:
-  virtual size_t SizeOfObject() override final;
+  size_t SizeOfObject() final;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MinidumpContextWriter);
@@ -67,10 +67,10 @@ class MinidumpContextX86Writer final : public MinidumpContextWriter {
 
  protected:
   // MinidumpWritable:
-  virtual bool WriteObject(FileWriterInterface* file_writer) override;
+  bool WriteObject(FileWriterInterface* file_writer) override;
 
   // MinidumpContextWriter:
-  virtual size_t ContextSize() const override;
+  size_t ContextSize() const override;
 
  private:
   MinidumpContextX86 context_;
@@ -98,11 +98,11 @@ class MinidumpContextAMD64Writer final : public MinidumpContextWriter {
 
  protected:
   // MinidumpWritable:
-  virtual size_t Alignment() override;
-  virtual bool WriteObject(FileWriterInterface* file_writer) override;
+  size_t Alignment() override;
+  bool WriteObject(FileWriterInterface* file_writer) override;
 
   // MinidumpContextWriter:
-  virtual size_t ContextSize() const override;
+  size_t ContextSize() const override;
 
  private:
   MinidumpContextAMD64 context_;
diff --git a/minidump/minidump_exception_writer.h b/minidump/minidump_exception_writer.h
index b18eefa..dc4ad6c 100644
--- a/minidump/minidump_exception_writer.h
+++ b/minidump/minidump_exception_writer.h
@@ -86,13 +86,13 @@ class MinidumpExceptionWriter final : public internal::MinidumpStreamWriter {
 
  protected:
   // MinidumpWritable:
-  virtual bool Freeze() override;
-  virtual size_t SizeOfObject() override;
-  virtual std::vector<MinidumpWritable*> Children() override;
-  virtual bool WriteObject(FileWriterInterface* file_writer) override;
+  bool Freeze() override;
+  size_t SizeOfObject() override;
+  std::vector<MinidumpWritable*> Children() override;
+  bool WriteObject(FileWriterInterface* file_writer) override;
 
   // MinidumpStreamWriter:
-  virtual MinidumpStreamType StreamType() const override;
+  MinidumpStreamType StreamType() const override;
 
  private:
   MINIDUMP_EXCEPTION_STREAM exception_;
diff --git a/minidump/minidump_file_writer.h b/minidump/minidump_file_writer.h
index bc9753d..2faa35b 100644
--- a/minidump/minidump_file_writer.h
+++ b/minidump/minidump_file_writer.h
@@ -62,15 +62,15 @@ class MinidumpFileWriter final : public internal::MinidumpWritable {
   //! rewinds to the beginning of the file and writes the correct value for this
   //! field. This prevents incompletely-written minidump files from being
   //! mistaken for valid ones.
-  virtual bool WriteEverything(FileWriterInterface* file_writer) override;
+  bool WriteEverything(FileWriterInterface* file_writer) override;
 
  protected:
   // MinidumpWritable:
-  virtual bool Freeze() override;
-  virtual size_t SizeOfObject() override;
-  virtual std::vector<MinidumpWritable*> Children() override;
-  virtual bool WillWriteAtOffsetImpl(off_t offset) override;
-  virtual bool WriteObject(FileWriterInterface* file_writer) override;
+  bool Freeze() override;
+  size_t SizeOfObject() override;
+  std::vector<MinidumpWritable*> Children() override;
+  bool WillWriteAtOffsetImpl(off_t offset) override;
+  bool WriteObject(FileWriterInterface* file_writer) override;
 
  private:
   MINIDUMP_HEADER header_;
diff --git a/minidump/minidump_file_writer_test.cc b/minidump/minidump_file_writer_test.cc
index c05e65e..0e92576 100644
--- a/minidump/minidump_file_writer_test.cc
+++ b/minidump/minidump_file_writer_test.cc
@@ -52,18 +52,18 @@ class TestStream final : public internal::MinidumpStreamWriter {
   ~TestStream() {}
 
   // MinidumpStreamWriter:
-  virtual MinidumpStreamType StreamType() const override {
+  MinidumpStreamType StreamType() const override {
     return stream_type_;
   }
 
  protected:
   // MinidumpWritable:
-  virtual size_t SizeOfObject() override {
+  size_t SizeOfObject() override {
     EXPECT_GE(state(), kStateFrozen);
     return stream_data_.size();
   }
 
-  virtual bool WriteObject(FileWriterInterface* file_writer) override {
+  bool WriteObject(FileWriterInterface* file_writer) override {
     EXPECT_EQ(state(), kStateWritable);
     return file_writer->Write(&stream_data_[0], stream_data_.size());
   }
diff --git a/minidump/minidump_memory_writer.h b/minidump/minidump_memory_writer.h
index 555915b..0f3c509 100644
--- a/minidump/minidump_memory_writer.h
+++ b/minidump/minidump_memory_writer.h
@@ -75,8 +75,8 @@ class MinidumpMemoryWriter : public internal::MinidumpWritable {
   virtual size_t MemoryRangeSize() const = 0;
 
   // MinidumpWritable:
-  virtual bool Freeze() override;
-  virtual size_t SizeOfObject() override final;
+  bool Freeze() override;
+  size_t SizeOfObject() final;
 
   //! \brief Returns the object’s desired byte-boundary alignment.
   //!
@@ -87,9 +87,9 @@ class MinidumpMemoryWriter : public internal::MinidumpWritable {
   //! \return `16`.
   //!
   //! \note Valid in #kStateFrozen or any subsequent state.
-  virtual size_t Alignment() override;
+  size_t Alignment() override;
 
-  virtual bool WillWriteAtOffsetImpl(off_t offset) override;
+  bool WillWriteAtOffsetImpl(off_t offset) override;
 
   //! \brief Returns the object’s desired write phase.
   //!
@@ -100,7 +100,7 @@ class MinidumpMemoryWriter : public internal::MinidumpWritable {
   //! \return #kPhaseLate.
   //!
   //! \note Valid in any state.
-  virtual Phase WritePhase() override final;
+  Phase WritePhase() final;
 
  private:
   MINIDUMP_MEMORY_DESCRIPTOR memory_descriptor_;
@@ -144,13 +144,13 @@ class MinidumpMemoryListWriter final : public internal::MinidumpStreamWriter {
 
  protected:
   // MinidumpWritable:
-  virtual bool Freeze() override;
-  virtual size_t SizeOfObject() override;
-  virtual std::vector<MinidumpWritable*> Children() override;
-  virtual bool WriteObject(FileWriterInterface* file_writer) override;
+  bool Freeze() override;
+  size_t SizeOfObject() override;
+  std::vector<MinidumpWritable*> Children() override;
+  bool WriteObject(FileWriterInterface* file_writer) override;
 
   // MinidumpStreamWriter:
-  virtual MinidumpStreamType StreamType() const override;
+  MinidumpStreamType StreamType() const override;
 
  private:
   MINIDUMP_MEMORY_LIST memory_list_base_;
diff --git a/minidump/minidump_memory_writer_test.cc b/minidump/minidump_memory_writer_test.cc
index b13f712..a59edcd 100644
--- a/minidump/minidump_memory_writer_test.cc
+++ b/minidump/minidump_memory_writer_test.cc
@@ -200,24 +200,24 @@ class TestMemoryStream final : public internal::MinidumpStreamWriter {
   TestMinidumpMemoryWriter* memory() { return &memory_; }
 
   // MinidumpStreamWriter:
-  virtual MinidumpStreamType StreamType() const override {
+  MinidumpStreamType StreamType() const override {
     return kBogusStreamType;
   }
 
  protected:
   // MinidumpWritable:
-  virtual size_t SizeOfObject() override {
+  size_t SizeOfObject() override {
     EXPECT_GE(state(), kStateFrozen);
     return 0;
   }
 
-  virtual std::vector<MinidumpWritable*> Children() override {
+  std::vector<MinidumpWritable*> Children() override {
     EXPECT_GE(state(), kStateFrozen);
     std::vector<MinidumpWritable*> children(1, memory());
     return children;
   }
 
-  virtual bool WriteObject(FileWriterInterface* file_writer) override {
+  bool WriteObject(FileWriterInterface* file_writer) override {
     EXPECT_EQ(kStateWritable, state());
     return true;
   }
diff --git a/minidump/minidump_memory_writer_test_util.h b/minidump/minidump_memory_writer_test_util.h
index 69b2aeb..5299f68 100644
--- a/minidump/minidump_memory_writer_test_util.h
+++ b/minidump/minidump_memory_writer_test_util.h
@@ -39,12 +39,12 @@ class TestMinidumpMemoryWriter final : public MinidumpMemoryWriter {
 
  protected:
   // MinidumpMemoryWriter:
-  virtual uint64_t MemoryRangeBaseAddress() const override;
-  virtual size_t MemoryRangeSize() const override;
+  uint64_t MemoryRangeBaseAddress() const override;
+  size_t MemoryRangeSize() const override;
 
   // MinidumpWritable:
-  virtual bool WillWriteAtOffsetImpl(off_t offset) override;
-  virtual bool WriteObject(FileWriterInterface* file_writer) override;
+  bool WillWriteAtOffsetImpl(off_t offset) override;
+  bool WriteObject(FileWriterInterface* file_writer) override;
 
  private:
   uint64_t base_address_;
diff --git a/minidump/minidump_misc_info_writer.h b/minidump/minidump_misc_info_writer.h
index f51f38c..f68d1be 100644
--- a/minidump/minidump_misc_info_writer.h
+++ b/minidump/minidump_misc_info_writer.h
@@ -82,10 +82,10 @@ class MinidumpMiscInfoWriter final : public internal::MinidumpStreamWriter {
 
  protected:
   // MinidumpWritable:
-  virtual bool Freeze() override;
-  virtual size_t SizeOfObject() override;
-  virtual bool WriteObject(FileWriterInterface* file_writer) override;
-  virtual MinidumpStreamType StreamType() const override;
+  bool Freeze() override;
+  size_t SizeOfObject() override;
+  bool WriteObject(FileWriterInterface* file_writer) override;
+  MinidumpStreamType StreamType() const override;
 
  private:
   //! \brief Returns the size of the object to be written based on
diff --git a/minidump/minidump_module_writer.h b/minidump/minidump_module_writer.h
index 401a5bd..a745f16 100644
--- a/minidump/minidump_module_writer.h
+++ b/minidump/minidump_module_writer.h
@@ -66,8 +66,8 @@ class MinidumpModuleCodeViewRecordPDBLinkWriter
   virtual ~MinidumpModuleCodeViewRecordPDBLinkWriter();
 
   // MinidumpWritable:
-  virtual size_t SizeOfObject() override;
-  virtual bool WriteObject(FileWriterInterface* file_writer) override;
+  size_t SizeOfObject() override;
+  bool WriteObject(FileWriterInterface* file_writer) override;
 
   //! \brief Returns a pointer to the raw CodeView record’s data.
   //!
@@ -154,9 +154,9 @@ class MinidumpModuleMiscDebugRecordWriter final
 
  protected:
   // MinidumpWritable:
-  virtual bool Freeze() override;
-  virtual size_t SizeOfObject() override;
-  virtual bool WriteObject(FileWriterInterface* file_writer) override;
+  bool Freeze() override;
+  size_t SizeOfObject() override;
+  bool WriteObject(FileWriterInterface* file_writer) override;
 
  private:
   IMAGE_DEBUG_MISC image_debug_misc_;
@@ -273,10 +273,10 @@ class MinidumpModuleWriter final : public internal::MinidumpWritable {
 
  protected:
   // MinidumpWritable:
-  virtual bool Freeze() override;
-  virtual size_t SizeOfObject() override;
-  virtual std::vector<MinidumpWritable*> Children() override;
-  virtual bool WriteObject(FileWriterInterface* file_writer) override;
+  bool Freeze() override;
+  size_t SizeOfObject() override;
+  std::vector<MinidumpWritable*> Children() override;
+  bool WriteObject(FileWriterInterface* file_writer) override;
 
  private:
   MINIDUMP_MODULE module_;
@@ -304,13 +304,13 @@ class MinidumpModuleListWriter final : public internal::MinidumpStreamWriter {
 
  protected:
   // MinidumpWritable:
-  virtual bool Freeze() override;
-  virtual size_t SizeOfObject() override;
-  virtual std::vector<MinidumpWritable*> Children() override;
-  virtual bool WriteObject(FileWriterInterface* file_writer) override;
+  bool Freeze() override;
+  size_t SizeOfObject() override;
+  std::vector<MinidumpWritable*> Children() override;
+  bool WriteObject(FileWriterInterface* file_writer) override;
 
   // MinidumpStreamWriter:
-  virtual MinidumpStreamType StreamType() const override;
+  MinidumpStreamType StreamType() const override;
 
  private:
   MINIDUMP_MODULE_LIST module_list_base_;
diff --git a/minidump/minidump_stream_writer.h b/minidump/minidump_stream_writer.h
index a901aae..6eddbab 100644
--- a/minidump/minidump_stream_writer.h
+++ b/minidump/minidump_stream_writer.h
@@ -51,7 +51,7 @@ class MinidumpStreamWriter : public MinidumpWritable {
   ~MinidumpStreamWriter() {}
 
   // MinidumpWritable:
-  virtual bool Freeze() override;
+  bool Freeze() override;
 
  private:
   MINIDUMP_DIRECTORY directory_list_entry_;
diff --git a/minidump/minidump_string_writer.h b/minidump/minidump_string_writer.h
index 9f5fceb..237d0d3 100644
--- a/minidump/minidump_string_writer.h
+++ b/minidump/minidump_string_writer.h
@@ -60,9 +60,9 @@ class MinidumpStringWriter : public MinidumpWritable {
   typedef typename Traits::MinidumpStringType MinidumpStringType;
   typedef typename Traits::StringType StringType;
 
-  virtual bool Freeze() override;
-  virtual size_t SizeOfObject() override;
-  virtual bool WriteObject(FileWriterInterface* file_writer) override;
+  bool Freeze() override;
+  size_t SizeOfObject() override;
+  bool WriteObject(FileWriterInterface* file_writer) override;
 
   //! \brief Sets the string to be written.
   //!
diff --git a/minidump/minidump_system_info_writer.h b/minidump/minidump_system_info_writer.h
index eeeb7f5..3d21959 100644
--- a/minidump/minidump_system_info_writer.h
+++ b/minidump/minidump_system_info_writer.h
@@ -166,13 +166,13 @@ class MinidumpSystemInfoWriter final : public internal::MinidumpStreamWriter {
 
  protected:
   // MinidumpWritable:
-  virtual bool Freeze() override;
-  virtual size_t SizeOfObject() override;
-  virtual std::vector<MinidumpWritable*> Children() override;
-  virtual bool WriteObject(FileWriterInterface* file_writer) override;
+  bool Freeze() override;
+  size_t SizeOfObject() override;
+  std::vector<MinidumpWritable*> Children() override;
+  bool WriteObject(FileWriterInterface* file_writer) override;
 
   // MinidumpStreamWriter:
-  virtual MinidumpStreamType StreamType() const override;
+  MinidumpStreamType StreamType() const override;
 
  private:
   MINIDUMP_SYSTEM_INFO system_info_;
diff --git a/minidump/minidump_thread_writer.h b/minidump/minidump_thread_writer.h
index db7ce43..92f2215 100644
--- a/minidump/minidump_thread_writer.h
+++ b/minidump/minidump_thread_writer.h
@@ -107,10 +107,10 @@ class MinidumpThreadWriter final : public internal::MinidumpWritable {
 
  protected:
   // MinidumpWritable:
-  virtual bool Freeze() override;
-  virtual size_t SizeOfObject() override;
-  virtual std::vector<MinidumpWritable*> Children() override;
-  virtual bool WriteObject(FileWriterInterface* file_writer) override;
+  bool Freeze() override;
+  size_t SizeOfObject() override;
+  std::vector<MinidumpWritable*> Children() override;
+  bool WriteObject(FileWriterInterface* file_writer) override;
 
  private:
   MINIDUMP_THREAD thread_;
@@ -164,13 +164,13 @@ class MinidumpThreadListWriter final : public internal::MinidumpStreamWriter {
 
  protected:
   // MinidumpWritable:
-  virtual bool Freeze() override;
-  virtual size_t SizeOfObject() override;
-  virtual std::vector<MinidumpWritable*> Children() override;
-  virtual bool WriteObject(FileWriterInterface* file_writer) override;
+  bool Freeze() override;
+  size_t SizeOfObject() override;
+  std::vector<MinidumpWritable*> Children() override;
+  bool WriteObject(FileWriterInterface* file_writer) override;
 
   // MinidumpStreamWriter:
-  virtual MinidumpStreamType StreamType() const override;
+  MinidumpStreamType StreamType() const override;
 
  private:
   MINIDUMP_THREAD_LIST thread_list_base_;
diff --git a/minidump/minidump_writable_test.cc b/minidump/minidump_writable_test.cc
index 6e345af..00e3257 100644
--- a/minidump/minidump_writable_test.cc
+++ b/minidump/minidump_writable_test.cc
@@ -60,7 +60,7 @@ class BaseTestMinidumpWritable : public crashpad::internal::MinidumpWritable {
   }
 
  protected:
-  virtual bool Freeze() override {
+  bool Freeze() override {
     EXPECT_EQ(kStateMutable, state());
     bool rv = MinidumpWritable::Freeze();
     EXPECT_TRUE(rv);
@@ -68,12 +68,12 @@ class BaseTestMinidumpWritable : public crashpad::internal::MinidumpWritable {
     return rv;
   }
 
-  virtual size_t Alignment() override {
+  size_t Alignment() override {
     EXPECT_GE(state(), kStateFrozen);
     return has_alignment_ ? alignment_ : MinidumpWritable::Alignment();
   }
 
-  virtual std::vector<MinidumpWritable*> Children() override {
+  std::vector<MinidumpWritable*> Children() override {
     EXPECT_GE(state(), kStateFrozen);
     if (!children_.empty()) {
       std::vector<MinidumpWritable*> children;
@@ -85,11 +85,11 @@ class BaseTestMinidumpWritable : public crashpad::internal::MinidumpWritable {
     return MinidumpWritable::Children();
   }
 
-  virtual Phase WritePhase() override {
+  Phase WritePhase() override {
     return has_phase_ ? phase_ : MinidumpWritable::Phase();
   }
 
-  virtual bool WillWriteAtOffsetImpl(off_t offset) override {
+  bool WillWriteAtOffsetImpl(off_t offset) override {
     EXPECT_EQ(state(), kStateFrozen);
     expected_offset_ = offset;
     bool rv = MinidumpWritable::WillWriteAtOffsetImpl(offset);
@@ -97,7 +97,7 @@ class BaseTestMinidumpWritable : public crashpad::internal::MinidumpWritable {
     return rv;
   }
 
-  virtual bool WriteObject(FileWriterInterface* file_writer) override {
+  bool WriteObject(FileWriterInterface* file_writer) override {
     EXPECT_EQ(state(), kStateWritable);
     EXPECT_EQ(expected_offset_, file_writer->Seek(0, SEEK_CUR));
 
@@ -126,12 +126,12 @@ class TestStringMinidumpWritable final : public BaseTestMinidumpWritable {
   void SetData(const std::string& string) { data_ = string; }
 
  protected:
-  virtual size_t SizeOfObject() override {
+  size_t SizeOfObject() override {
     EXPECT_GE(state(), kStateFrozen);
     return data_.size();
   }
 
-  virtual bool WriteObject(FileWriterInterface* file_writer) override {
+  bool WriteObject(FileWriterInterface* file_writer) override {
     BaseTestMinidumpWritable::WriteObject(file_writer);
     bool rv = file_writer->Write(&data_[0], data_.size());
     EXPECT_TRUE(rv);
@@ -491,12 +491,12 @@ class TestRVAMinidumpWritable final : public BaseTestMinidumpWritable {
   void SetRVA(MinidumpWritable* other) { other->RegisterRVA(&rva_); }
 
  protected:
-  virtual size_t SizeOfObject() override {
+  size_t SizeOfObject() override {
     EXPECT_GE(state(), kStateFrozen);
     return sizeof(rva_);
   }
 
-  virtual bool WriteObject(FileWriterInterface* file_writer) override {
+  bool WriteObject(FileWriterInterface* file_writer) override {
     BaseTestMinidumpWritable::WriteObject(file_writer);
     EXPECT_TRUE(file_writer->Write(&rva_, sizeof(rva_)));
     return true;
@@ -628,13 +628,13 @@ class TestLocationDescriptorMinidumpWritable final
   void SetString(const std::string& string) { string_ = string; }
 
  protected:
-  virtual size_t SizeOfObject() override {
+  size_t SizeOfObject() override {
     EXPECT_GE(state(), kStateFrozen);
     // NUL-terminate.
     return sizeof(location_descriptor_) + string_.size() + 1;
   }
 
-  virtual bool WriteObject(FileWriterInterface* file_writer) override {
+  bool WriteObject(FileWriterInterface* file_writer) override {
     BaseTestMinidumpWritable::WriteObject(file_writer);
     WritableIoVec iov;
     iov.iov_base = &location_descriptor_;
diff --git a/snapshot/exception_snapshot_mac.h b/snapshot/exception_snapshot_mac.h
index 7f6fb0b..f0fc8e6 100644
--- a/snapshot/exception_snapshot_mac.h
+++ b/snapshot/exception_snapshot_mac.h
@@ -60,12 +60,12 @@ class ExceptionSnapshotMac final : public ExceptionSnapshot {
 
   // ExceptionSnapshot:
 
-  virtual const CPUContext* Context() const override;
-  virtual uint64_t ThreadID() const override;
-  virtual uint32_t Exception() const override;
-  virtual uint32_t ExceptionInfo() const override;
-  virtual uint64_t ExceptionAddress() const override;
-  virtual const std::vector<uint64_t>& Codes() const override;
+  const CPUContext* Context() const override;
+  uint64_t ThreadID() const override;
+  uint32_t Exception() const override;
+  uint32_t ExceptionInfo() const override;
+  uint64_t ExceptionAddress() const override;
+  const std::vector<uint64_t>& Codes() const override;
 
  private:
 #if defined(ARCH_CPU_X86_FAMILY)
diff --git a/snapshot/memory_snapshot_mac.h b/snapshot/memory_snapshot_mac.h
index 4964a77..6754b42 100644
--- a/snapshot/memory_snapshot_mac.h
+++ b/snapshot/memory_snapshot_mac.h
@@ -49,9 +49,9 @@ class MemorySnapshotMac final : public MemorySnapshot {
 
   // MemorySnapshot:
 
-  virtual uint64_t Address() const override;
-  virtual size_t Size() const override;
-  virtual bool Read(Delegate* delegate) const override;
+  uint64_t Address() const override;
+  size_t Size() const override;
+  bool Read(Delegate* delegate) const override;
 
  private:
   ProcessReader* process_reader_;  // weak
diff --git a/snapshot/system_snapshot_mac.h b/snapshot/system_snapshot_mac.h
index 104c6da..3eadc37 100644
--- a/snapshot/system_snapshot_mac.h
+++ b/snapshot/system_snapshot_mac.h
@@ -58,31 +58,28 @@ class SystemSnapshotMac final : public SystemSnapshot {
 
   // SystemSnapshot:
 
-  virtual CPUArchitecture GetCPUArchitecture() const override;
-  virtual uint32_t CPURevision() const override;
-  virtual uint8_t CPUCount() const override;
-  virtual std::string CPUVendor() const override;
-  virtual void CPUFrequency(uint64_t* current_hz,
-                            uint64_t* max_hz) const override;
-  virtual uint32_t CPUX86Signature() const override;
-  virtual uint64_t CPUX86Features() const override;
-  virtual uint64_t CPUX86ExtendedFeatures() const override;
-  virtual uint32_t CPUX86Leaf7Features() const override;
-  virtual bool CPUX86SupportsDAZ() const override;
-  virtual OperatingSystem GetOperatingSystem() const override;
-  virtual bool OSServer() const override;
-  virtual void OSVersion(int* major,
-                         int* minor,
-                         int* bugfix,
-                         std::string* build) const override;
-  virtual std::string OSVersionFull() const override;
-  virtual bool NXEnabled() const override;
-  virtual std::string MachineDescription() const override;
-  virtual void TimeZone(DaylightSavingTimeStatus* dst_status,
-                        int* standard_offset_seconds,
-                        int* daylight_offset_seconds,
-                        std::string* standard_name,
-                        std::string* daylight_name) const override;
+  CPUArchitecture GetCPUArchitecture() const override;
+  uint32_t CPURevision() const override;
+  uint8_t CPUCount() const override;
+  std::string CPUVendor() const override;
+  void CPUFrequency(uint64_t* current_hz, uint64_t* max_hz) const override;
+  uint32_t CPUX86Signature() const override;
+  uint64_t CPUX86Features() const override;
+  uint64_t CPUX86ExtendedFeatures() const override;
+  uint32_t CPUX86Leaf7Features() const override;
+  bool CPUX86SupportsDAZ() const override;
+  OperatingSystem GetOperatingSystem() const override;
+  bool OSServer() const override;
+  void OSVersion(
+      int* major, int* minor, int* bugfix, std::string* build) const override;
+  std::string OSVersionFull() const override;
+  bool NXEnabled() const override;
+  std::string MachineDescription() const override;
+  void TimeZone(DaylightSavingTimeStatus* dst_status,
+                int* standard_offset_seconds,
+                int* daylight_offset_seconds,
+                std::string* standard_name,
+                std::string* daylight_name) const override;
 
  private:
   std::string os_version_full_;
diff --git a/snapshot/system_snapshot_mac_test.cc b/snapshot/system_snapshot_mac_test.cc
index 3d0c813..f7f1652 100644
--- a/snapshot/system_snapshot_mac_test.cc
+++ b/snapshot/system_snapshot_mac_test.cc
@@ -48,7 +48,7 @@ class SystemSnapshotMacTest : public testing::Test {
   }
 
   // testing::Test:
-  virtual void SetUp() override {
+  void SetUp() override {
     ASSERT_TRUE(process_reader_.Initialize(mach_task_self()));
     ASSERT_EQ(0, gettimeofday(&snapshot_time_, nullptr))
         << ErrnoMessage("gettimeofday");
diff --git a/snapshot/thread_snapshot_mac.h b/snapshot/thread_snapshot_mac.h
index dc6c5b9..b998209 100644
--- a/snapshot/thread_snapshot_mac.h
+++ b/snapshot/thread_snapshot_mac.h
@@ -53,12 +53,12 @@ class ThreadSnapshotMac final : public ThreadSnapshot {
 
   // ThreadSnapshot:
 
-  virtual const CPUContext* Context() const override;
-  virtual const MemorySnapshot* Stack() const override;
-  virtual uint64_t ThreadID() const override;
-  virtual int SuspendCount() const override;
-  virtual int Priority() const override;
-  virtual uint64_t ThreadSpecificDataAddress() const override;
+  const CPUContext* Context() const override;
+  const MemorySnapshot* Stack() const override;
+  uint64_t ThreadID() const override;
+  int SuspendCount() const override;
+  int Priority() const override;
+  uint64_t ThreadSpecificDataAddress() const override;
 
  private:
 #if defined(ARCH_CPU_X86_FAMILY)
diff --git a/util/file/file_writer.h b/util/file/file_writer.h
index e454848..54c59c9 100644
--- a/util/file/file_writer.h
+++ b/util/file/file_writer.h
@@ -105,19 +105,19 @@ class FileWriter : public FileWriterInterface {
   //!
   //! \note It is only valid to call this method between a successful Open() and
   //!     a Close().
-  virtual bool Write(const void* data, size_t size) override;
+  bool Write(const void* data, size_t size) override;
 
   //! \copydoc FileWriterInterface::WriteIoVec()
   //!
   //! \note It is only valid to call this method between a successful Open() and
   //!     a Close().
-  virtual bool WriteIoVec(std::vector<WritableIoVec>* iovecs) override;
+  bool WriteIoVec(std::vector<WritableIoVec>* iovecs) override;
 
   //! \copydoc FileWriterInterface::Seek()
   //!
   //! \note It is only valid to call this method between a successful Open() and
   //!     a Close().
-  virtual off_t Seek(off_t offset, int whence) override;
+  off_t Seek(off_t offset, int whence) override;
 
  private:
   base::ScopedFD fd_;
diff --git a/util/file/string_file_writer.h b/util/file/string_file_writer.h
index 4b4002b..fa1e7de 100644
--- a/util/file/string_file_writer.h
+++ b/util/file/string_file_writer.h
@@ -45,9 +45,9 @@ class StringFileWriter : public FileWriterInterface {
   void Reset();
 
   // FileWriterInterface:
-  virtual bool Write(const void* data, size_t size) override;
-  virtual bool WriteIoVec(std::vector<WritableIoVec>* iovecs) override;
-  virtual off_t Seek(off_t offset, int whence) override;
+  bool Write(const void* data, size_t size) override;
+  bool WriteIoVec(std::vector<WritableIoVec>* iovecs) override;
+  off_t Seek(off_t offset, int whence) override;
 
  private:
   //! \brief The virtual file’s contents.
diff --git a/util/mach/exc_client_variants_test.cc b/util/mach/exc_client_variants_test.cc
index b299189..0aa0882 100644
--- a/util/mach/exc_client_variants_test.cc
+++ b/util/mach/exc_client_variants_test.cc
@@ -133,7 +133,7 @@ class TestExcClientVariants : public UniversalMachExcServer,
  private:
   // MachMultiprocess:
 
-  virtual void MachMultiprocessParent() override {
+  void MachMultiprocessParent() override {
     kern_return_t kr = MachMessageServer::Run(this,
                                               LocalPort(),
                                               MACH_MSG_OPTION_NONE,
@@ -146,7 +146,7 @@ class TestExcClientVariants : public UniversalMachExcServer,
     EXPECT_TRUE(handled_);
   }
 
-  virtual void MachMultiprocessChild() override {
+  void MachMultiprocessChild() override {
     const exception_type_t exception = exception_;
     const mach_exception_data_type_t code[] = {
         exception_code_,
diff --git a/util/mach/exc_server_variants.h b/util/mach/exc_server_variants.h
index b06d3bf..15ab08c 100644
--- a/util/mach/exc_server_variants.h
+++ b/util/mach/exc_server_variants.h
@@ -103,13 +103,12 @@ class ExcServer : public MachMessageServer::Interface {
 
   // MachMessageServer::Interface:
 
-  virtual bool MachMessageServerFunction(
-      const mach_msg_header_t* in_header,
-      mach_msg_header_t* out_header,
-      bool* destroy_complex_request) override;
+  bool MachMessageServerFunction(const mach_msg_header_t* in_header,
+                                 mach_msg_header_t* out_header,
+                                 bool* destroy_complex_request) override;
 
-  virtual mach_msg_size_t MachMessageServerRequestSize() override;
-  virtual mach_msg_size_t MachMessageServerReplySize() override;
+  mach_msg_size_t MachMessageServerRequestSize() override;
+  mach_msg_size_t MachMessageServerReplySize() override;
 
  private:
   Interface* interface_;  // weak
@@ -191,13 +190,12 @@ class MachExcServer : public MachMessageServer::Interface {
 
   // MachMessageServer::Interface:
 
-  virtual bool MachMessageServerFunction(
-      const mach_msg_header_t* in_header,
-      mach_msg_header_t* out_header,
-      bool* destroy_complex_request) override;
+  bool MachMessageServerFunction(const mach_msg_header_t* in_header,
+                                 mach_msg_header_t* out_header,
+                                 bool* destroy_complex_request) override;
 
-  virtual mach_msg_size_t MachMessageServerRequestSize() override;
-  virtual mach_msg_size_t MachMessageServerReplySize() override;
+  mach_msg_size_t MachMessageServerRequestSize() override;
+  mach_msg_size_t MachMessageServerReplySize() override;
 
  private:
   Interface* interface_;  // weak
@@ -249,14 +247,14 @@ class SimplifiedExcServer : public ExcServer, public ExcServer::Interface {
 
   // ExcServer::Interface:
 
-  virtual kern_return_t CatchExceptionRaise(exception_handler_t exception_port,
-                                            thread_t thread,
-                                            task_t task,
-                                            exception_type_t exception,
-                                            const exception_data_type_t* code,
-                                            mach_msg_type_number_t code_count,
-                                            bool* destroy_request) override;
-  virtual kern_return_t CatchExceptionRaiseState(
+  kern_return_t CatchExceptionRaise(exception_handler_t exception_port,
+                                    thread_t thread,
+                                    task_t task,
+                                    exception_type_t exception,
+                                    const exception_data_type_t* code,
+                                    mach_msg_type_number_t code_count,
+                                    bool* destroy_request) override;
+  kern_return_t CatchExceptionRaiseState(
       exception_handler_t exception_port,
       exception_type_t exception,
       const exception_data_type_t* code,
@@ -266,7 +264,7 @@ class SimplifiedExcServer : public ExcServer, public ExcServer::Interface {
       mach_msg_type_number_t old_state_count,
       thread_state_t new_state,
       mach_msg_type_number_t* new_state_count) override;
-  virtual kern_return_t CatchExceptionRaiseStateIdentity(
+  kern_return_t CatchExceptionRaiseStateIdentity(
       exception_handler_t exception_port,
       thread_t thread,
       task_t task,
@@ -340,15 +338,14 @@ class SimplifiedMachExcServer : public MachExcServer,
 
   // MachExcServer::Interface:
 
-  virtual kern_return_t CatchMachExceptionRaise(
-      exception_handler_t exception_port,
-      thread_t thread,
-      task_t task,
-      exception_type_t exception,
-      const mach_exception_data_type_t* code,
-      mach_msg_type_number_t code_count,
-      bool* destroy_request) override;
-  virtual kern_return_t CatchMachExceptionRaiseState(
+  kern_return_t CatchMachExceptionRaise(exception_handler_t exception_port,
+                                        thread_t thread,
+                                        task_t task,
+                                        exception_type_t exception,
+                                        const mach_exception_data_type_t* code,
+                                        mach_msg_type_number_t code_count,
+                                        bool* destroy_request) override;
+  kern_return_t CatchMachExceptionRaiseState(
       exception_handler_t exception_port,
       exception_type_t exception,
       const mach_exception_data_type_t* code,
@@ -358,7 +355,7 @@ class SimplifiedMachExcServer : public MachExcServer,
       mach_msg_type_number_t old_state_count,
       thread_state_t new_state,
       mach_msg_type_number_t* new_state_count) override;
-  virtual kern_return_t CatchMachExceptionRaiseStateIdentity(
+  kern_return_t CatchMachExceptionRaiseStateIdentity(
       exception_handler_t exception_port,
       thread_t thread,
       task_t task,
@@ -400,29 +397,28 @@ class UniversalMachExcServer
 
   // MachMessageServer::Interface:
 
-  virtual bool MachMessageServerFunction(
-      const mach_msg_header_t* in_header,
-      mach_msg_header_t* out_header,
-      bool* destroy_complex_request) override;
+  bool MachMessageServerFunction(const mach_msg_header_t* in_header,
+                                 mach_msg_header_t* out_header,
+                                 bool* destroy_complex_request) override;
 
-  virtual mach_msg_size_t MachMessageServerRequestSize() override;
-  virtual mach_msg_size_t MachMessageServerReplySize() override;
+  mach_msg_size_t MachMessageServerRequestSize() override;
+  mach_msg_size_t MachMessageServerReplySize() override;
 
   // internal::SimplifiedExcServer::Interface:
 
-  virtual kern_return_t CatchException(exception_behavior_t behavior,
-                                       exception_handler_t exception_port,
-                                       thread_t thread,
-                                       task_t task,
-                                       exception_type_t exception,
-                                       const exception_data_type_t* code,
-                                       mach_msg_type_number_t code_count,
-                                       thread_state_flavor_t* flavor,
-                                       const natural_t* old_state,
-                                       mach_msg_type_number_t old_state_count,
-                                       thread_state_t new_state,
-                                       mach_msg_type_number_t* new_state_count,
-                                       bool* destroy_complex_request) override;
+  kern_return_t CatchException(exception_behavior_t behavior,
+                               exception_handler_t exception_port,
+                               thread_t thread,
+                               task_t task,
+                               exception_type_t exception,
+                               const exception_data_type_t* code,
+                               mach_msg_type_number_t code_count,
+                               thread_state_flavor_t* flavor,
+                               const natural_t* old_state,
+                               mach_msg_type_number_t old_state_count,
+                               thread_state_t new_state,
+                               mach_msg_type_number_t* new_state_count,
+                               bool* destroy_complex_request) override;
 
  private:
   internal::SimplifiedExcServer exc_server_;
diff --git a/util/mach/exc_server_variants_test.cc b/util/mach/exc_server_variants_test.cc
index c5450f0..598c3bc 100644
--- a/util/mach/exc_server_variants_test.cc
+++ b/util/mach/exc_server_variants_test.cc
@@ -940,7 +940,7 @@ class TestExcServerVariants : public UniversalMachExcServer,
  private:
   // MachMultiprocess:
 
-  virtual void MachMultiprocessParent() override {
+  void MachMultiprocessParent() override {
     kern_return_t kr = MachMessageServer::Run(this,
                                               LocalPort(),
                                               MACH_MSG_OPTION_NONE,
@@ -953,7 +953,7 @@ class TestExcServerVariants : public UniversalMachExcServer,
     EXPECT_TRUE(handled_);
   }
 
-  virtual void MachMultiprocessChild() override {
+  void MachMultiprocessChild() override {
     // Set the parent as the exception handler for EXC_CRASH.
     kern_return_t kr = task_set_exception_ports(
         mach_task_self(), EXC_MASK_CRASH, RemotePort(), behavior_, flavor_);
diff --git a/util/mach/exception_ports_test.cc b/util/mach/exception_ports_test.cc
index 9007305..1b1f38e 100644
--- a/util/mach/exception_ports_test.cc
+++ b/util/mach/exception_ports_test.cc
@@ -352,7 +352,7 @@ class TestExceptionPorts : public UniversalMachExcServer,
 
   // MachMultiprocess:
 
-  virtual void MachMultiprocessParent() override {
+  void MachMultiprocessParent() override {
     // Wait for the child process to be ready. It needs to have all of its
     // threads set up before proceeding if in kSetOutOfProcess mode.
     char c;
@@ -460,7 +460,7 @@ class TestExceptionPorts : public UniversalMachExcServer,
     CheckedReadFDAtEOF(ReadPipeFD());
   }
 
-  virtual void MachMultiprocessChild() override {
+  void MachMultiprocessChild() override {
     Child child(this);
     child.Run();
   }
diff --git a/util/mach/mach_message_server_test.cc b/util/mach/mach_message_server_test.cc
index fe6f0ed..b4862ec 100644
--- a/util/mach/mach_message_server_test.cc
+++ b/util/mach/mach_message_server_test.cc
@@ -271,11 +271,11 @@ class TestMachMessageServer : public MachMessageServer::Interface,
     return true;
   }
 
-  virtual mach_msg_size_t MachMessageServerRequestSize() override {
+  mach_msg_size_t MachMessageServerRequestSize() override {
     return sizeof(RequestMessage);
   }
 
-  virtual mach_msg_size_t MachMessageServerReplySize() override {
+  mach_msg_size_t MachMessageServerReplySize() override {
     return sizeof(ReplyMessage);
   }
 
@@ -304,7 +304,7 @@ class TestMachMessageServer : public MachMessageServer::Interface,
 
   // MachMultiprocess:
 
-  virtual void MachMultiprocessParent() override {
+  void MachMultiprocessParent() override {
     mach_port_t local_port = LocalPort();
 
     kern_return_t kr;
@@ -381,7 +381,7 @@ class TestMachMessageServer : public MachMessageServer::Interface,
     }
   }
 
-  virtual void MachMultiprocessChild() override {
+  void MachMultiprocessChild() override {
     if (options_.child_wait_for_parent_pipe_early) {
       // Wait until the parent is done setting things up on its end.
       char c;
diff --git a/util/mach/scoped_task_suspend_test.cc b/util/mach/scoped_task_suspend_test.cc
index c8606a0..76def55 100644
--- a/util/mach/scoped_task_suspend_test.cc
+++ b/util/mach/scoped_task_suspend_test.cc
@@ -50,7 +50,7 @@ class ScopedTaskSuspendTest final : public MachMultiprocess {
  private:
   // MachMultiprocess:
 
-  virtual void MachMultiprocessParent() override {
+  void MachMultiprocessParent() override {
     task_t child_task = ChildTask();
 
     EXPECT_EQ(0, SuspendCount(child_task));
@@ -70,7 +70,7 @@ class ScopedTaskSuspendTest final : public MachMultiprocess {
     EXPECT_EQ(0, SuspendCount(child_task));
   }
 
-  virtual void MachMultiprocessChild() override {
+  void MachMultiprocessChild() override {
     CheckedReadFDAtEOF(ReadPipeFD());
   }
 
diff --git a/util/test/mac/mach_multiprocess.h b/util/test/mac/mach_multiprocess.h
index e709533..85139d5 100644
--- a/util/test/mac/mach_multiprocess.h
+++ b/util/test/mac/mach_multiprocess.h
@@ -49,7 +49,7 @@ class MachMultiprocess : public Multiprocess {
   ~MachMultiprocess();
 
   // Multiprocess:
-  virtual void PreFork() override;
+  void PreFork() override;
 
   //! \brief Returns a receive right for the local port.
   //!
@@ -79,7 +79,7 @@ class MachMultiprocess : public Multiprocess {
   //! MachMultiprocessParent().
   //!
   //! Subclasses must override MachMultiprocessParent() instead of this method.
-  virtual void MultiprocessParent() override final;
+  void MultiprocessParent() final;
 
   //! \brief Runs the child side of the test.
   //!
@@ -88,7 +88,7 @@ class MachMultiprocess : public Multiprocess {
   //! assertion) is detected, the child will exit with a failure status.
   //!
   //! Subclasses must override MachMultiprocessChild() instead of this method.
-  virtual void MultiprocessChild() override final;
+  void MultiprocessChild() final;
 
   //! \brief The subclass-provided parent routine.
   //!
diff --git a/util/test/mac/mach_multiprocess_test.cc b/util/test/mac/mach_multiprocess_test.cc
index 388831f..dc9f7e9 100644
--- a/util/test/mac/mach_multiprocess_test.cc
+++ b/util/test/mac/mach_multiprocess_test.cc
@@ -32,9 +32,9 @@ class TestMachMultiprocess final : public MachMultiprocess {
  private:
   // MachMultiprocess will have already exercised the Mach ports for IPC and the
   // child task port.
-  virtual void MachMultiprocessParent() override {}
+  void MachMultiprocessParent() override {}
 
-  virtual void MachMultiprocessChild() override {}
+  void MachMultiprocessChild() override {}
 
   DISALLOW_COPY_AND_ASSIGN(TestMachMultiprocess);
 };
diff --git a/util/test/multiprocess.h b/util/test/multiprocess.h
index c4eadde..c3a7949 100644
--- a/util/test/multiprocess.h
+++ b/util/test/multiprocess.h
@@ -92,7 +92,7 @@ class Multiprocess {
   //! provided that they call the superclass’ implementation first as follows:
   //!
   //! \code
-  //!   virtual void PreFork() override {
+  //!   void PreFork() override {
   //!     ASSERT_NO_FATAL_FAILURE(Multiprocess::PreFork());
   //!
   //!     // Place subclass-specific pre-fork code here.
diff --git a/util/test/multiprocess_exec.h b/util/test/multiprocess_exec.h
index fecdfb3..5b5f7a2 100644
--- a/util/test/multiprocess_exec.h
+++ b/util/test/multiprocess_exec.h
@@ -54,11 +54,11 @@ class MultiprocessExec : public Multiprocess {
   ~MultiprocessExec();
 
   // Multiprocess:
-  virtual void PreFork() override;
+  void PreFork() override;
 
  private:
   // Multiprocess:
-  virtual void MultiprocessChild() override;
+  void MultiprocessChild() override;
 
   std::string command_;
   std::vector<std::string> arguments_;
diff --git a/util/test/multiprocess_exec_test.cc b/util/test/multiprocess_exec_test.cc
index 3111602..c30843e 100644
--- a/util/test/multiprocess_exec_test.cc
+++ b/util/test/multiprocess_exec_test.cc
@@ -32,7 +32,7 @@ class TestMultiprocessExec final : public MultiprocessExec {
   ~TestMultiprocessExec() {}
 
  private:
-  virtual void MultiprocessParent() override {
+  void MultiprocessParent() override {
     char c = 'z';
     CheckedWriteFD(WritePipeFD(), &c, 1);
 
diff --git a/util/test/multiprocess_test.cc b/util/test/multiprocess_test.cc
index a766585..92dc6cf 100644
--- a/util/test/multiprocess_test.cc
+++ b/util/test/multiprocess_test.cc
@@ -35,7 +35,7 @@ class TestMultiprocess final : public Multiprocess {
  private:
   // Multiprocess:
 
-  virtual void MultiprocessParent() override {
+  void MultiprocessParent() override {
     int read_fd = ReadPipeFD();
     char c;
     CheckedReadFD(read_fd, &c, 1);
@@ -53,7 +53,7 @@ class TestMultiprocess final : public Multiprocess {
     CheckedReadFDAtEOF(read_fd);
   }
 
-  virtual void MultiprocessChild() override {
+  void MultiprocessChild() override {
     int write_fd = WritePipeFD();
 
     char c = 'M';
@@ -102,10 +102,10 @@ class TestMultiprocessUnclean final : public Multiprocess {
 
   // Multiprocess:
 
-  virtual void MultiprocessParent() override {
+  void MultiprocessParent() override {
   }
 
-  virtual void MultiprocessChild() override {
+  void MultiprocessChild() override {
     if (type_ == kAbort) {
       abort();
     } else {
@@ -216,7 +216,7 @@ class TestMultiprocessClosePipe final : public Multiprocess {
 
   // Multiprocess:
 
-  virtual void MultiprocessParent() override {
+  void MultiprocessParent() override {
     ASSERT_NO_FATAL_FAILURE(VerifyInitial());
 
     if (who_closes_ == kParentCloses) {
@@ -226,7 +226,7 @@ class TestMultiprocessClosePipe final : public Multiprocess {
     }
   }
 
-  virtual void MultiprocessChild() override {
+  void MultiprocessChild() override {
     ASSERT_NO_FATAL_FAILURE(VerifyInitial());
 
     if (who_closes_ == kChildCloses) {