When all IOKit user clients are blocked in the WebContent process, there is no need to allow opening of IOKit services.
<rdar://problem/96957606>
Pull request: https://github.com/WebKit/WebKit/pull/2368
Committed 252419@main (73035815bfbb): <https://commits.webkit.org/252419@main> Reviewed commits have been landed. Closing PR #2368 and removing active labels.