Replace a notimplemented with a bug about full screen mode.
Replace a notimplemented with a bug about full screen mode.

Review URL: http://codereview.chromium.org/40142


git-svn-id: http://src.chromium.org/svn/trunk/src@10956 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: b90454f5adef65177d734d62762c4259328023ba
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