RealtimeOutgoingVideoSource black frame size computation is wrong in case of rotation
<rdar://problem/112823005>
Pull request: https://github.com/WebKit/WebKit/pull/16097
Committed 266358@main (50d6b4d81168): <https://commits.webkit.org/266358@main> Reviewed commits have been landed. Closing PR #16097 and removing active labels.