Watch out for invalid delegate and container after destroying the WebViewPlugin.

BUG=49836
TEST=Enable FlashBlock, block all plugins and go to a site with a flash animation. No crashy!

Review URL: http://codereview.chromium.org/3020031

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@53932 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed