[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: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@39144 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser