This issue was found in Bug 88028.
Created attachment 146789 [details] Patch
Comment on attachment 146789 [details] Patch This seems like it should be unit testable.
Comment on attachment 146789 [details] Patch Clearing flags on attachment: 146789 Committed r119974: <http://trac.webkit.org/changeset/119974>
All reviewed patches have been landed. Closing bug.