Second attempt to land https://webrtc-review.googlesource.com/c/src/+/16180 Now removes voice_engine dependency from peerconnection and fixes a minor const issue in NullAudioPoller. TBR=solenberg Bug: webrtc:7313 Change-Id: Ibfddbdc76118581e4a4dc64575203f84c1659e5c Reviewed-on: https://webrtc-review.googlesource.com/17784 Reviewed-by: Henrik Andreassson <henrika@webrtc.org> Commit-Queue: Henrik Andreassson <henrika@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20526}