This was missed during the refactor done in https://webkit.org/b/182069.
Created attachment 333322 [details] Patch
Comment on attachment 333322 [details] Patch Clearing flags on attachment: 333322 Committed r228251: <https://trac.webkit.org/changeset/228251>
All reviewed patches have been landed. Closing bug.
<rdar://problem/37333249>