This, then lots of is<Frame> then we can start making RemoteFrames!
Pull request: https://github.com/WebKit/WebKit/pull/5411
Committed 255584@main (5a3fd1c32eaa): <https://commits.webkit.org/255584@main> Reviewed commits have been landed. Closing PR #5411 and removing active labels.
<rdar://problem/101207918>