This replaces the functionality provided by
AudioPriorityBitrateAllocationStrategy, removing the need provide that
component via injection in all clients using audio bitrate priority.
Bug: webrtc:10286
Change-Id: I3bafab56d24459d9d27dc07abffdc8538440a346
Reviewed-on: https://webrtc-review.googlesource.com/c/121402
Reviewed-by: Oskar Sundbom <ossu@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Reviewed-by: Christoffer Rodbro <crodbro@webrtc.org>
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26651}