[iOS] Entering fullscreen from iframe without explicit viewport results in badly cropped video
<rdar://problem/123725878>
Pull request: https://github.com/WebKit/WebKit/pull/25818
Committed 276138@main (66ba699e6910): <https://commits.webkit.org/276138@main> Reviewed commits have been landed. Closing PR #25818 and removing active labels.
Re-opening for pull request https://github.com/WebKit/WebKit/pull/26171
Committed 276427@main (db57a9aa346b): <https://commits.webkit.org/276427@main> Reviewed commits have been landed. Closing PR #26171 and removing active labels.