Also delete the method RTPPayloadRegistry::red_payload_type() and remnants of RED support in RTPReceiverAudio. Bug: webrtc:8995,webrtc:5922 Change-Id: Iee310f5a8628ba70942e8c0277a856d2ca1f9b35 Reviewed-on: https://webrtc-review.googlesource.com/61500 Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Reviewed-by: Oskar Sundbom <ossu@webrtc.org> Commit-Queue: Niels Moller <nisse@webrtc.org> Cr-Commit-Position: refs/heads/master@{#22425}