We shouldn't send the message to _every_ `WebKit::WebFrame`, as that seems to include sub-frames, which can't be inspected independently from the main frame, so only send to the main frame.
Created attachment 395696 [details] Patch
Committed r259739: <https://trac.webkit.org/changeset/259739> All reviewed patches have been landed. Closing bug and clearing flags on attachment 395696 [details].
<rdar://problem/61467874>