Disable flaky PPAPINaClNewlibTest.MediaStreamAudioTrack on Mac.

chrome/test/ppapi/ppapi_browsertest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stddef.h>
 
 #include "base/macros.h"
 #include "base/path_service.h"
 #include "base/test/test_timeouts.h"
 #include "build/build_config.h"
@@ skipping 1141 matching lines @@
 #define MAYBE_Compositor1 DISABLED_Compositor1
 #else
 // flaky on Linux: http://crbug.com/396482
 #define MAYBE_Compositor0 DISABLED_Compositor0
 #define MAYBE_Compositor1 DISABLED_Compositor1
 #endif
 
 TEST_PPAPI_NACL_SUBTESTS(MAYBE_Compositor0, RUN_COMPOSITOR_SUBTESTS_0)
 TEST_PPAPI_NACL_SUBTESTS(MAYBE_Compositor1, RUN_COMPOSITOR_SUBTESTS_1)
 
-#if defined(OS_LINUX) || defined(OS_WIN) || defined(OS_CHROMEOS)
-// Flaky on ChromeOS, Linux and Windows (crbug.com/438729)
+#if defined(OS_LINUX) || defined(OS_WIN) || defined(OS_CHROMEOS) || \
+    defined(OS_MACOSX)
+// Flaky on ChromeOS, Linux, Windows, and Mac (crbug.com/438729)
 #define MAYBE_MediaStreamAudioTrack DISABLED_MediaStreamAudioTrack
 #else
 #define MAYBE_MediaStreamAudioTrack MediaStreamAudioTrack
 #endif
 TEST_PPAPI_NACL(MAYBE_MediaStreamAudioTrack)
 
 #if defined(OS_WIN)
 // Flaky on Windows (crbug.com/633519)
 #define MAYBE_MediaStreamVideoTrack DISABLED_MediaStreamVideoTrack
 #else
@@ skipping 152 matching lines @@
                        MAYBE_PPAPI_NACL(NoSocketPermissions)) {
   RunTests("no_socket_permissions");
 }
 
 IN_PROC_BROWSER_TEST_F(NewlibPackagedAppTest,
                        MAYBE_PPAPI_NACL(SocketPermissions)) {
   RunTests("socket_permissions");
 }
 
 #endif