Update from https://crrev.com/317530

base/test/test_suite.cc

Index: base/test/test_suite.cc
diff --git a/base/test/test_suite.cc b/base/test/test_suite.cc
index 903e93ea07a7b8aba49e66f49603dcda88bdae89..d40dd983eb6b143fdbf97466ce25e66ec2be92dc 100644
--- a/base/test/test_suite.cc
+++ b/base/test/test_suite.cc
@@ -35,6 +35,14 @@
 #endif  // OS_IOS
 #endif  // OS_MACOSX
 
+#if !defined(OS_WIN)
+#include "base/i18n/rtl.h"
+#if !defined(OS_IOS)
+#include "base/strings/string_util.h"
+#include "third_party/icu/source/common/unicode/uloc.h"
+#endif
+#endif
+
 #if defined(OS_ANDROID)
 #include "base/test/test_support_android.h"
 #endif
@@ -321,6 +329,22 @@ void TestSuite::Initialize() {
   }
 
   base::i18n::InitializeICU();
+  // On the Mac OS X command line, the default locale is *_POSIX. In Chromium,
+  // the locale is set via an OS X locale API and is never *_POSIX.
+  // Some tests (such as those involving word break iterator) will behave
+  // differently and fail if we use *POSIX locale. Setting it to en_US here
+  // does not affect tests that explicitly overrides the locale for testing.
+  // This can be an issue on all platforms other than Windows.
+  // TODO(jshin): Should we set the locale via an OS X locale API here?
+#if !defined(OS_WIN)
+#if defined(OS_IOS)
+  base::i18n::SetICUDefaultLocale("en_US");
+#else
+  std::string default_locale(uloc_getDefault());
+  if (EndsWith(default_locale, "POSIX", false))
+    base::i18n::SetICUDefaultLocale("en_US");
+#endif
+#endif
 
   CatchMaybeTests();
   ResetCommandLine();