diff --git a/ipc/chromium/src/base/message_pump_win.cc b/ipc/chromium/src/base/message_pump_win.cc
index f8d2f48196d6..530958b358a8 100644
--- a/ipc/chromium/src/base/message_pump_win.cc
+++ b/ipc/chromium/src/base/message_pump_win.cc
@@ -150,17 +150,11 @@ void MessagePumpForUI::PumpOutPendingPaintMessages() {
   // to get the job done.  Actual common max is 4 peeks, but we'll be a little
   // safe here.
   const int kMaxPeekCount = 20;
-  bool win2k = win_util::GetWinVersion() <= win_util::WINVERSION_2000;
   int peek_count;
   for (peek_count = 0; peek_count < kMaxPeekCount; ++peek_count) {
     MSG msg;
-    if (win2k) {
-      if (!PeekMessage(&msg, NULL, WM_PAINT, WM_PAINT, PM_REMOVE))
-        break;
-    } else {
-      if (!PeekMessage(&msg, NULL, 0, 0, PM_REMOVE | PM_QS_PAINT))
-        break;
-    }
+    if (!PeekMessage(&msg, NULL, 0, 0, PM_REMOVE | PM_QS_PAINT))
+      break;
     ProcessMessageHelper(msg);
     if (state_->should_quit)  // Handle WM_QUIT.
       break;
diff --git a/ipc/chromium/src/base/platform_thread_win.cc b/ipc/chromium/src/base/platform_thread_win.cc
index beac77a05dca..35f4b90e9617 100644
--- a/ipc/chromium/src/base/platform_thread_win.cc
+++ b/ipc/chromium/src/base/platform_thread_win.cc
@@ -70,7 +70,7 @@ void PlatformThread::SetName(const char* name) {
 bool PlatformThread::Create(size_t stack_size, Delegate* delegate,
                             PlatformThreadHandle* thread_handle) {
   unsigned int flags = 0;
-  if (stack_size > 0 && win_util::GetWinVersion() >= win_util::WINVERSION_XP) {
+  if (stack_size > 0) {
     flags = STACK_SIZE_PARAM_IS_A_RESERVATION;
   } else {
     stack_size = 0;
diff --git a/ipc/chromium/src/base/process_util_win.cc b/ipc/chromium/src/base/process_util_win.cc
index a81da5b6529c..b01488c17762 100644
--- a/ipc/chromium/src/base/process_util_win.cc
+++ b/ipc/chromium/src/base/process_util_win.cc
@@ -19,6 +19,8 @@
 #include <algorithm>
 #include "prenv.h"
 
+#include "mozilla/WindowsVersion.h"
+
 namespace {
 
 // System pagesize. This value remains constant on x86/64 architectures.
@@ -294,7 +296,7 @@ bool LaunchApp(const std::wstring& cmdline,
 
   LPPROC_THREAD_ATTRIBUTE_LIST lpAttributeList = NULL;
   // Don't even bother trying pre-Vista...
-  if (win_util::GetWinVersion() >= win_util::WINVERSION_VISTA) {
+  if (mozilla::IsVistaOrLater()) {
     // setup our handle array first - if we end up with no handles that can
     // be inherited we can avoid trying to do the ThreadAttributeList dance...
     HANDLE handlesToInherit[2];
diff --git a/ipc/chromium/src/base/win_util.cc b/ipc/chromium/src/base/win_util.cc
index c52449f89b5f..d0985d85d09e 100644
--- a/ipc/chromium/src/base/win_util.cc
+++ b/ipc/chromium/src/base/win_util.cc
@@ -15,45 +15,6 @@
 
 namespace win_util {
 
-WinVersion GetWinVersion() {
-  static bool checked_version = false;
-  static WinVersion win_version = WINVERSION_PRE_2000;
-  if (!checked_version) {
-    OSVERSIONINFOEX version_info;
-    version_info.dwOSVersionInfoSize = sizeof version_info;
-    GetVersionEx(reinterpret_cast<OSVERSIONINFO*>(&version_info));
-    if (version_info.dwMajorVersion == 5) {
-      switch (version_info.dwMinorVersion) {
-        case 0:
-          win_version = WINVERSION_2000;
-          break;
-        case 1:
-          win_version = WINVERSION_XP;
-          break;
-        case 2:
-        default:
-          win_version = WINVERSION_SERVER_2003;
-          break;
-      }
-    } else if (version_info.dwMajorVersion == 6) {
-      if (version_info.wProductType != VER_NT_WORKSTATION) {
-        // 2008 is 6.0, and 2008 R2 is 6.1.
-        win_version = WINVERSION_2008;
-      } else {
-        if (version_info.dwMinorVersion == 0) {
-          win_version = WINVERSION_VISTA;
-        } else {
-          win_version = WINVERSION_WIN7;
-        }
-      }
-    } else if (version_info.dwMajorVersion > 6) {
-      win_version = WINVERSION_WIN7;
-    }
-    checked_version = true;
-  }
-  return win_version;
-}
-
 bool IsShiftPressed() {
   return (::GetKeyState(VK_SHIFT) & 0x80) == 0x80;
 }
diff --git a/ipc/chromium/src/base/win_util.h b/ipc/chromium/src/base/win_util.h
index 5bfa818ceebc..cc1799f16982 100644
--- a/ipc/chromium/src/base/win_util.h
+++ b/ipc/chromium/src/base/win_util.h
@@ -14,22 +14,6 @@
 
 namespace win_util {
 
-// NOTE: Keep these in order so callers can do things like
-// "if (GetWinVersion() > WINVERSION_2000) ...".  It's OK to change the values,
-// though.
-enum WinVersion {
-  WINVERSION_PRE_2000 = 0,  // Not supported
-  WINVERSION_2000 = 1,
-  WINVERSION_XP = 2,
-  WINVERSION_SERVER_2003 = 3,
-  WINVERSION_VISTA = 4,
-  WINVERSION_2008 = 5,
-  WINVERSION_WIN7 = 6
-};
-
-// Returns the running version of Windows.
-WinVersion GetWinVersion();
-
 // Returns true if the shift key is currently pressed.
 bool IsShiftPressed();