[Mac] Allow popups to go fullscreen.
[Mac] Allow popups to go fullscreen.

BUG=108570
TEST=See reduced test case in bug.


Review URL: http://codereview.chromium.org/9252019

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@118181 0039d316-1c4b-4281-b951-d872f2087c98

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