The SourceBufferPrivate currently queries the MediaSourcePrivate to get the media element duration. We want to avoid that as they may not be running on the same thread.
<rdar://problem/119114938>
Pull request: https://github.com/WebKit/WebKit/pull/21256
Committed 271514@main (adb77f8a601c): <https://commits.webkit.org/271514@main> Reviewed commits have been landed. Closing PR #21256 and removing active labels.