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Regression(r279601) ProcessAssertion may get destroyed on a backgroun…
…d thread https://bugs.webkit.org/show_bug.cgi?id=227875 <rdar://76972252> Reviewed by Geoffrey Garen. r279601 added an internal WorkQueue to ProcessAssertion, so that we could acquire the RunningBoard assertion asynchronously on the background queue. When dispatching to the background queue, we capture |protectedThis|, which means that ProcessAssertion may now get destroyed on the background queue. ProcessAssertion is a main thread object and destroying it on a non-main thread can lead to crashes. * UIProcess/ProcessAssertion.h: * UIProcess/ios/ProcessAssertionIOS.mm: (WebKit::ProcessAssertion::ProcessAssertion): (WebKit::ProcessAssertion::~ProcessAssertion): Canonical link: https://commits.webkit.org/239595@main git-svn-id: https://svn.webkit.org/repository/webkit/trunk@279835 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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