Do not delay getUserMedia promise resolution on VPIO unit prewarming
<rdar://problem/128112002>
Pull request: https://github.com/WebKit/WebKit/pull/28588
Committed 278851@main (63db44388a49): <https://commits.webkit.org/278851@main> Reviewed commits have been landed. Closing PR #28588 and removing active labels.
Re-opened since this is blocked by bug 274251
Pull request: https://github.com/WebKit/WebKit/pull/28646
Committed 278860@main (4238f637a283): <https://commits.webkit.org/278860@main> Reviewed commits have been landed. Closing PR #28646 and removing active labels.