Revert "Disable MediaGalleriesPlatformAppBrowserTest.MediaGalleriesCopyTo for being flaky."

This reverts commit 9afacfdd.

Better than even odds that this patch fixed the underlying issue:

https://codereview.chromium.org/57423008/

BUG=314576
R=thestig@chromium.org

Review URL: https://codereview.chromium.org/70493002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235673 0039d316-1c4b-4281-b951-d872f2087c98

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

@@ -246,14 +246,8 @@ IN_PROC_BROWSER_TEST_F(MediaGalleriesPlatformAppBrowserTest,
       << message_;
 }
 
-// Flaky: crbug.com/314576
-#if defined(OS_WIN)
-IN_PROC_BROWSER_TEST_F(MediaGalleriesPlatformAppBrowserTest,
-                       DISABLED_MediaGalleriesCopyTo) {
-#else
 IN_PROC_BROWSER_TEST_F(MediaGalleriesPlatformAppBrowserTest,
                        MediaGalleriesCopyTo) {
-#endif
   base::ScopedTempDir temp_dir;
   ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
   MakeFakeMediaGalleryForTest(browser()->profile(), temp_dir.path());