Fix media/video-ended-does-not-hold-sleep-assertion.htmliOS layout test crash
<rdar://problem/122342671>
Pull request: https://github.com/WebKit/WebKit/pull/23888
Committed 274158@main (f8e706aae35a): <https://commits.webkit.org/274158@main> Reviewed commits have been landed. Closing PR #23888 and removing active labels.