make it BFC only.
Created attachment 463494 [details] Patch
Created attachment 463498 [details] Patch
Created attachment 463502 [details] [fast-cq]Patch
Found 1 new test failure: media/video-seek-have-nothing.html
Committed 256609@main (1fe3e43cf187): <https://commits.webkit.org/256609@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 463502 [details].
<rdar://problem/102279099>