O2D Mac: Don't crash if the user tries to go to fullscreen with O2D.
O2D Mac: Don't crash if the user tries to go to fullscreen with O2D.

TEST=tried to go fullscreen with O2D on Mac in FF, Chrome, and Sarafi and verified nothing happens
BUG=none

Review URL: http://codereview.chromium.org/6650012

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@77389 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