We might want to use Optional in lieu of unique_ptr for that.
Created attachment 280226 [details] Patch
Comment on attachment 280226 [details] Patch R=me
Comment on attachment 280226 [details] Patch Clearing flags on attachment: 280226 Committed r201556: <http://trac.webkit.org/changeset/201556>
All reviewed patches have been landed. Closing bug.