GitLab

Make the VideoDetector FullscreenWindow test use
GetWindowState() to access WindowState objects. Otherwise,
the WindowStates don't get unregistered as WindowObservers
when they're destroyed. This was responsible for the test
crashes that resulted in r266681 being reverted.

BUG=365364

Review URL: https://codereview.chromium.org/303163003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@273783 0039d316-1c4b-4281-b951-d872f2087c98