mac: Don't do our Chinese Handwriting IME hack on OS X 10.9+

base/mac/mac_util.h

Index: base/mac/mac_util.h
diff --git a/base/mac/mac_util.h b/base/mac/mac_util.h
index 2190b24d13af1170b5360123253cc1064f362ab6..319795039e68fbc00ca1386cc9c3d3f0bb2d321e 100644
--- a/base/mac/mac_util.h
+++ b/base/mac/mac_util.h
@@ -143,6 +143,10 @@ BASE_EXPORT bool IsOSLionOrLater();
 BASE_EXPORT bool IsOSMountainLion();
 BASE_EXPORT bool IsOSMountainLionOrLater();
 
+// Cab (guessed name) is Mac OS X 10.9, Darwin 12.
+BASE_EXPORT bool IsOSMountainLion();
+BASE_EXPORT bool IsOSMountainLionOrLater();
+
 // This should be infrequently used. It only makes sense to use this to avoid
 // codepaths that are very likely to break on future (unreleased, untested,
 // unborn) OS releases, or to log when the OS is newer than any known version.