[Mac] Enable fullscreen
[Mac] Enable fullscreen

BUG=31638
TEST=Should be able to toggle fullscreen mode.
Review URL: http://codereview.chromium.org/567029

git-svn-id: http://src.chromium.org/svn/trunk/src@39144 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 1c09f2b024961091a7bd81c8e9423b3eff917103
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