Fixed deadlocks occurring in Chrome during O3D teardown when O3D is in full-screen mode and another plugin on the page is making an NPAPI call. Deferred O3D's window destruction to work around this issue.
Fixed deadlocks occurring in Chrome during O3D teardown when O3D is in
full-screen mode and another plugin on the page is making an NPAPI
call. Deferred O3D's window destruction to work around this issue.

Tested O3D and related tests in all browsers; this fixes the deadlock
and seems to not introduce any other instability.

Review URL: http://codereview.chromium.org/502097

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@35134 0039d316-1c4b-4281-b951-d872f2087c98

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