Add release assertion in CallbackMap::invalidate() to make sure it is called on the main thread.
Created attachment 313640 [details] Patch
<rdar://problem/32911286>
Comment on attachment 313640 [details] Patch Clearing flags on attachment: 313640 Committed r218712: <http://trac.webkit.org/changeset/218712>
All reviewed patches have been landed. Closing bug.