diff --git a/patches/common/chromium/.patches b/patches/common/chromium/.patches
index f324126af5..0bef8abb81 100644
--- a/patches/common/chromium/.patches
+++ b/patches/common/chromium/.patches
@@ -72,3 +72,6 @@ revert_build_swiftshader_for_arm32.patch
 fix_backup_includes_for_ptrace_get_thread_area_on_arm_arm64.patch
 color_chooser_mac.patch
 color_chooser_win.patch
+fix_disable_usage_of_abort_report_np_in_mas_builds.patch
+fix_disable_usage_of_pthread_fchdir_np_and_pthread_chdir_np_in_mas.patch
+fix_disable_usage_of_setapplicationisdaemon_and.patch
diff --git a/patches/common/chromium/fix_disable_usage_of_abort_report_np_in_mas_builds.patch b/patches/common/chromium/fix_disable_usage_of_abort_report_np_in_mas_builds.patch
new file mode 100644
index 0000000000..313f62f957
--- /dev/null
+++ b/patches/common/chromium/fix_disable_usage_of_abort_report_np_in_mas_builds.patch
@@ -0,0 +1,36 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Samuel Attard <sattard@slack-corp.com>
+Date: Mon, 4 Mar 2019 14:43:36 -0800
+Subject: fix: disable usage of abort_report_np in MAS builds
+
+
+diff --git a/sandbox/mac/sandbox_logging.cc b/sandbox/mac/sandbox_logging.cc
+index 4eebcea13d17093a685cc79b8a8f61fb3894c71b..d704dced154f1d5db097e566a9c681438f94475d 100644
+--- a/sandbox/mac/sandbox_logging.cc
++++ b/sandbox/mac/sandbox_logging.cc
+@@ -22,9 +22,11 @@
+     __builtin_unreachable();                                                   \
+   }
+ 
++#if !defined(MAS_BUILD)
+ extern "C" {
+ void abort_report_np(const char*, ...);
+ }
++#endif
+ 
+ namespace sandbox {
+ 
+@@ -94,11 +96,13 @@ void SendAslLog(Level level, const char* message) {
+   asl_set(asl_message.get(), ASL_KEY_MSG, message);
+   asl_send(asl_client.get(), asl_message.get());
+ 
++  #if !defined(MAS_BUILD)
+   if (__builtin_available(macOS 10.11, *)) {
+     if (level == Level::FATAL) {
+       abort_report_np(message);
+     }
+   }
++  #endif
+ }
+ 
+ // |error| is strerror(errno) when a P* logging function is called. Pass
diff --git a/patches/common/chromium/fix_disable_usage_of_pthread_fchdir_np_and_pthread_chdir_np_in_mas.patch b/patches/common/chromium/fix_disable_usage_of_pthread_fchdir_np_and_pthread_chdir_np_in_mas.patch
new file mode 100644
index 0000000000..a49d46dd7b
--- /dev/null
+++ b/patches/common/chromium/fix_disable_usage_of_pthread_fchdir_np_and_pthread_chdir_np_in_mas.patch
@@ -0,0 +1,54 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Samuel Attard <sattard@slack-corp.com>
+Date: Mon, 4 Mar 2019 14:46:48 -0800
+Subject: fix: disable usage of pthread_fchdir_np and pthread_chdir_np in MAS
+ builds
+
+
+diff --git a/base/process/launch_mac.cc b/base/process/launch_mac.cc
+index 6c0e14fc3332c27309c83137cff9f060ed306aea..2f77af0cafbc0122603bc2735f6327e2e42a07b6 100644
+--- a/base/process/launch_mac.cc
++++ b/base/process/launch_mac.cc
+@@ -24,10 +24,12 @@
+ // descriptor. libpthread only exposes a syscall wrapper starting in
+ // macOS 10.12, but the system call dates back to macOS 10.5. On older OSes,
+ // the syscall is issued directly.
++#if !defined(MAS_BUILD)
+ extern "C" {
+ int pthread_chdir_np(const char*) API_AVAILABLE(macosx(10.12));
+ int pthread_fchdir_np(int fd) API_AVAILABLE(macosx(10.12));
+ }
++#endif
+ 
+ namespace base {
+ 
+@@ -94,21 +96,29 @@ class PosixSpawnFileActions {
+ };
+ 
+ int ChangeCurrentThreadDirectory(const char* path) {
++  #if defined(MAS_BUILD)
++  return syscall(SYS___pthread_chdir, path);
++  #else
+   if (__builtin_available(macOS 10.12, *)) {
+     return pthread_chdir_np(path);
+   } else {
+     return syscall(SYS___pthread_chdir, path);
+   }
++  #endif
+ }
+ 
+ // The recommended way to unset a per-thread cwd is to set a new value to an
+ // invalid file descriptor, per libpthread-218.1.3/private/private.h.
+ int ResetCurrentThreadDirectory() {
++  #if defined(MAS_BUILD)
++  return syscall(SYS___pthread_fchdir, -1);
++  #else
+   if (__builtin_available(macOS 10.12, *)) {
+     return pthread_fchdir_np(-1);
+   } else {
+     return syscall(SYS___pthread_fchdir, -1);
+   }
++  #endif
+ }
+ 
+ struct GetAppOutputOptions {
diff --git a/patches/common/chromium/fix_disable_usage_of_setapplicationisdaemon_and.patch b/patches/common/chromium/fix_disable_usage_of_setapplicationisdaemon_and.patch
new file mode 100644
index 0000000000..af4483027d
--- /dev/null
+++ b/patches/common/chromium/fix_disable_usage_of_setapplicationisdaemon_and.patch
@@ -0,0 +1,52 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Samuel Attard <sattard@slack-corp.com>
+Date: Mon, 4 Mar 2019 14:51:45 -0800
+Subject: fix: disable usage of SetApplicationIsDaemon and
+ _LSSetApplicationLaunchServicesServerConnectionStatus in MAS builds
+
+
+diff --git a/content/utility/utility_service_factory.cc b/content/utility/utility_service_factory.cc
+index 4450cc711772c600f138acb5458eb8ab0801ecf5..58e81aac8f8c97e5a3b3cd32b4d95789e14d2d31 100644
+--- a/content/utility/utility_service_factory.cc
++++ b/content/utility/utility_service_factory.cc
+@@ -195,7 +195,7 @@ void UtilityServiceFactory::RunNetworkServiceOnIOThread(
+ std::unique_ptr<service_manager::Service>
+ UtilityServiceFactory::CreateAudioService(
+     service_manager::mojom::ServiceRequest request) {
+-#if defined(OS_MACOSX)
++#if defined(OS_MACOSX) && !defined(MAS_BUILD)
+   // Don't connect to launch services when running sandboxed
+   // (https://crbug.com/874785).
+   if (base::FeatureList::IsEnabled(
+diff --git a/sandbox/mac/system_services.cc b/sandbox/mac/system_services.cc
+index caa30bb378b30331f90057fe7ce3aec724104bf8..a766daa808495f7872051e129c6ad9f76f54e4fe 100644
+--- a/sandbox/mac/system_services.cc
++++ b/sandbox/mac/system_services.cc
+@@ -9,16 +9,19 @@
+ 
+ #include "base/mac/mac_logging.h"
+ 
++#if !defined(MAS_BUILD)
+ extern "C" {
+ OSStatus SetApplicationIsDaemon(Boolean isDaemon);
+ void _LSSetApplicationLaunchServicesServerConnectionStatus(
+     uint64_t flags,
+     bool (^connection_allowed)(CFDictionaryRef options));
+ }  // extern "C"
++#endif
+ 
+ namespace sandbox {
+ 
+ void DisableLaunchServices() {
++  #if !defined(MAS_BUILD)
+   // Allow the process to continue without a LaunchServices ASN. The
+   // INIT_Process function in HIServices will abort if it cannot connect to
+   // launchservicesd to get an ASN. By setting this flag, HIServices skips
+@@ -32,6 +35,7 @@ void DisableLaunchServices() {
+       0, ^bool(CFDictionaryRef options) {
+         return false;
+       });
++  #endif
+ }
+ 
+ }  // namespace sandbox