RemoteAudioSourceProviderManager should be a WorkQueueMessageReceiver (not a ThreadMessageReceiver), since it uses a WorkQueue (not a WTF::Thread). This simplifies the code a bit.
Created attachment 417101 [details] Patch
Committed r271213: <https://trac.webkit.org/changeset/271213> All reviewed patches have been landed. Closing bug and clearing flags on attachment 417101 [details].
<rdar://problem/72862304>