GitLab

Fix plugin so that frames can still be painted after the decoder has
been destroyed.

BUG=NONE
TEST=gles2 consistently runs without crashing

Review URL: http://codereview.chromium.org/7607014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@96196 0039d316-1c4b-4281-b951-d872f2087c98