RealtimeOutgoingAudioSource/RealtimeOutgoingVideoSource should unobserve before destruction time. They might ref themselves in observer callbacks
<rdar://problem/56858330>
Created attachment 382723 [details] Patch
Comment on attachment 382723 [details] Patch Clearing flags on attachment: 382723 Committed r251989: <https://trac.webkit.org/changeset/251989>
All reviewed patches have been landed. Closing bug.