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: http://src.chromium.org/svn/trunk/src@35134 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: d83b9863eb45b007d135867ead8b02a784841f0c
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser