Mac: Fix buttons not tinting to theme.
Mac: Fix buttons not tinting to theme.

BUG=http://crbug.com/24429
TEST=buttons should tint

Review URL: http://codereview.chromium.org/273037

git-svn-id: http://src.chromium.org/svn/trunk/src@28819 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 9cddf916371a1768a1a9f875a082ac70a0bef132
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser