Prevents user from getting stuck in fullscreen mode with the cinnamon window manager and Linux Aura

BUG=347408
TEST=Manual, see bug

Review URL: https://codereview.chromium.org/183893003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254228 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254228