REGRESSION(265596@main) Vertical WebVTT cues are laid out horizontally
<rdar://problem/111909315>
Pull request: https://github.com/WebKit/WebKit/pull/15637
Committed 265860@main (c4d1167df42e): <https://commits.webkit.org/265860@main> Reviewed commits have been landed. Closing PR #15637 and removing active labels.