When using ManagedMediaExtension, attempting to use a source buffer will cause a crash as it's missing SkipVTableValidation.
<rdar://problem/105489108>
Pull request: https://github.com/WebKit/WebKit/pull/10137
Committed 260360@main (b4f656f61284): <https://commits.webkit.org/260360@main> Reviewed commits have been landed. Closing PR #10137 and removing active labels.