Fix a crashing bug when shutting down the plugin process.
Fix a crashing bug when shutting down the plugin process.


Review URL: http://codereview.chromium.org/459

git-svn-id: http://src.chromium.org/svn/trunk/src@1747 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: d5c647dfd3131fd6c65080ef874229444e4d0551
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