Disable MediaGalleriesPlatformAppBrowserTest.MediaGalleriesRead as its flaking.

chrome/browser/extensions/api/media_galleries/media_galleries_apitest.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 "base/auto_reset.h"
 #include "base/callback.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/json/json_writer.h"
 #include "base/numerics/safe_conversions.h"
@@ skipping 498 matching lines @@
 IN_PROC_BROWSER_TEST_F(MediaGalleriesPlatformAppBrowserTest, NoGalleriesRead) {
   ASSERT_TRUE(RunMediaGalleriesTest("no_galleries")) << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(MediaGalleriesPlatformAppBrowserTest,
                        NoGalleriesCopyTo) {
   ASSERT_TRUE(RunMediaGalleriesTest("no_galleries_copy_to")) << message_;
 }
 
 // Test is flaky. crbug.com/416128
-#if defined(OS_MACOSX)
-#define MAYBE_MediaGalleriesRead DISABLED_MediaGalleriesRead
-#else
-#define MAYBE_MediaGalleriesRead MediaGalleriesRead
-#endif
 IN_PROC_BROWSER_TEST_F(MediaGalleriesPlatformAppBrowserTest,
-                       MAYBE_MediaGalleriesRead) {
+                       DISABLED_MediaGalleriesRead) {
   RemoveAllGalleries();
   MakeSingleFakeGallery(NULL);
   base::ListValue custom_args;
   custom_args.AppendInteger(test_jpg_size());
 
   ASSERT_TRUE(RunMediaGalleriesTestWithArg("read_access", custom_args))
       << message_;
 }
 
 // Test is flaky, it fails on certain bots, namely WinXP Tests(1) and Linux
@@ skipping 139 matching lines @@
 
   base::ListValue custom_args;
 #if defined(USE_PROPRIETARY_CODECS)
   custom_args.AppendBoolean(true);
 #else
   custom_args.AppendBoolean(false);
 #endif
   ASSERT_TRUE(RunMediaGalleriesTestWithArg("media_metadata", custom_args))
       << message_;
 }