Disable flaky test: MediaGalleriesRead.

chrome/browser/extensions/api/media_galleries/media_galleries_apitest.cc

Index: chrome/browser/extensions/api/media_galleries/media_galleries_apitest.cc
diff --git a/chrome/browser/extensions/api/media_galleries/media_galleries_apitest.cc b/chrome/browser/extensions/api/media_galleries/media_galleries_apitest.cc
index 7fae535d4165d7a09bc4d8cee25d952a8ea1cb38..367d890dd022182359dab0ae90e43a3ede03ffb7 100644
--- a/chrome/browser/extensions/api/media_galleries/media_galleries_apitest.cc
+++ b/chrome/browser/extensions/api/media_galleries/media_galleries_apitest.cc
@@ -515,8 +515,14 @@ IN_PROC_BROWSER_TEST_F(MediaGalleriesPlatformAppBrowserTest,
   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,
-                       MediaGalleriesRead) {
+                       MAYBE_MediaGalleriesRead) {
   RemoveAllGalleries();
   MakeSingleFakeGallery(NULL);
   base::ListValue custom_args;