Interestingly after all these years they are still public.
<rdar://problem/35406184>
Created attachment 326301 [details] Patch
Created attachment 326303 [details] Patch
Created attachment 326305 [details] Patch
Comment on attachment 326305 [details] Patch Clearing flags on attachment: 326305 Committed r224579: <https://trac.webkit.org/changeset/224579>
All reviewed patches have been landed. Closing bug.