RemoteAudioMediaStreamTrackRendererInternalUnitManager::StartUnit has unused description parameter
<rdar://problem/102086488>
Pull request: https://github.com/WebKit/WebKit/pull/6247
Committed 256479@main (b7242f1f85c6): <https://commits.webkit.org/256479@main> Reviewed commits have been landed. Closing PR #6247 and removing active labels.