There are some issues in it, even if maybe none of them shows up on tests.
Created attachment 201996 [details] Patch
For me it fixes media/event-attributes.html although it is a totally different bug according to bug 83704. Still I get it unexpectedly pass only with the patch.
Comment on attachment 201996 [details] Patch Clearing flags on attachment: 201996 Committed r150435: <http://trac.webkit.org/changeset/150435>
All reviewed patches have been landed. Closing bug.