- Remove AddChannel/RemoveChannel from AudioRenderer interface. BUG=webrtc:4690 Committed: https://crrev.com/1c0bb386b67835feb5934f503dddfe0912bce3ac Cr-Commit-Position: refs/heads/master@{#10226} Review URL: https://codereview.webrtc.org/1399553003 Cr-Commit-Position: refs/heads/master@{#10235}