The MediaSessionActionHandler now holds a weak reference to its callback so when the MediaSession is visited it should mark any action handlers that have been added to it.
<rdar://problem/108913983>
Pull request: https://github.com/WebKit/WebKit/pull/13459
Committed 263715@main (0743137c2f4f): <https://commits.webkit.org/263715@main> Reviewed commits have been landed. Closing PR #13459 and removing active labels.
Re-opened since this is blocked by bug 256488