Change argument type for VideoProviderInterface::SetVideoPlayout. Replace VideoMediaChannel::SetRenderer and VideoChannel::SetRenderer by SetSink. Alse deleted unused member variables VideoMediaChannel::renderer_ and VideoChannel::renderer_. BUG=webrtc:5426 Review URL: https://codereview.webrtc.org/1668493002 Cr-Commit-Position: refs/heads/master@{#11485}