The fix for PR #254167 hasn't been upstreamed completely, here are the missing hunks.
Created attachment 198328 [details] Patch
LGTM
Comment on attachment 198328 [details] Patch Ok.
Comment on attachment 198328 [details] Patch Clearing flags on attachment: 198328 Committed r148512: <http://trac.webkit.org/changeset/148512>
All reviewed patches have been landed. Closing bug.