Use CFEqual to check for VideoFrame pixel primaries
<rdar://problem/102513990>
<rdar://102425691>
Pull request: https://github.com/WebKit/WebKit/pull/6631
Committed 257017@main (7560d94d186b): <https://commits.webkit.org/257017@main> Reviewed commits have been landed. Closing PR #6631 and removing active labels.