Disable MediaStreamAudioTest.CallbackOnTrackInitialization on Mac.

content/renderer/media/media_stream_audio_unittest.cc

Index: content/renderer/media/media_stream_audio_unittest.cc
diff --git a/content/renderer/media/media_stream_audio_unittest.cc b/content/renderer/media/media_stream_audio_unittest.cc
index 225e87b2cb09531d653169236dc3350ea9740240..defbb51410b85f7b95bca729ec2fd19c03d716da 100644
--- a/content/renderer/media/media_stream_audio_unittest.cc
+++ b/content/renderer/media/media_stream_audio_unittest.cc
@@ -460,8 +460,15 @@ TEST_F(MediaStreamAudioTest, EnableAndDisableTracks) {
   track()->RemoveSink(&sink);
 }
 
+// https://crbug.com/709231 tracks test failures on Mac10.9 Tests (dbg).
+#if defined(OS_MACOSX)
+#define MAYBE_CallbackOnTrackInitialization \
+  DISABLED_CallbackOnTrackInitialization
+#else
+#define MAYBE_CallbackOnTrackInitialization CallbackOnTrackInitialization
+#endif
 // Tests that a callback is fired when initialization completes on a track.
-TEST_F(MediaStreamAudioTest, CallbackOnTrackInitialization) {
+TEST_F(MediaStreamAudioTest, MAYBE_CallbackOnTrackInitialization) {
   // Create a source, connect it to track, and connect the track to a
   // sink.
   blink_audio_source_.setExtraData(new FakeMediaStreamAudioSource());