Have AudioSendStream register CNG payload types with the RtpRtcpModule.

TBR=kwiberg@webrtc.org # Turn perf-bots green again

BUG=webrtc:5806

Review-Url: https://codereview.webrtc.org/2844803003
Cr-Original-Commit-Position: refs/heads/master@{#17911}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 3b9ff38d8a10d46f69680c5634b4814fb02378e2
3 files changed