REGRESSION(272969@main): Null-deref crash in SourceBufferPrivateAVFObjC::trackDidChangeEnabled
<rdar://problem/122444388>
Pull request: https://github.com/WebKit/WebKit/pull/24009
Committed 274323@main (56b164c3ab85): <https://commits.webkit.org/274323@main> Reviewed commits have been landed. Closing PR #24009 and removing active labels.