Scheme registries are used by CSP and SecurityOrigin and we are now using them for ping loads.
Created attachment 336790 [details] Patch
<rdar://problem/39010625>
Comment on attachment 336790 [details] Patch Clearing flags on attachment: 336790 Committed r230079: <https://trac.webkit.org/changeset/230079>
All reviewed patches have been landed. Closing bug.