Fix Android Clang Build

Remove incorrect OVERRIDE after
http://src.chromium.org/viewvc/chrome?view=rev&revision=240420

BUG=293608
R=apiccion@chromium.org

Review URL: https://codereview.chromium.org/114633002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240435 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240435