Was fixed in https://bugs.webkit.org/show_bug.cgi?id=145586 and then broken by http://trac.webkit.org/changeset/186698.
<rdar://problem/21827661>
Created attachment 256817 [details] Patch
Comment on attachment 256817 [details] Patch rs=me
Comment on attachment 256817 [details] Patch Clearing flags on attachment: 256817 Committed r186831: <http://trac.webkit.org/changeset/186831>
All reviewed patches have been landed. Closing bug.