Disabled flaky NotificationBitmapFetcherBrowserTest.HandleImageFailedTest on Windows Debug.

BUG=316488
TBR=petewil@chromium.org,dcheng@chromium.org

Review URL: https://codereview.chromium.org/59453010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233763 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 233763