Wire-up BWE feedback for audio receive streams.

webrtc/audio/audio_receive_stream.h

Index: webrtc/audio/audio_receive_stream.h
diff --git a/webrtc/audio/audio_receive_stream.h b/webrtc/audio/audio_receive_stream.h
index 42286af22b9d584f7744292b8050ecd47cafd118..4940c6a64cc8d6ad7e8c1b521a9d2c937d1de52f 100644
--- a/webrtc/audio/audio_receive_stream.h
+++ b/webrtc/audio/audio_receive_stream.h
@@ -17,6 +17,7 @@
 #include "webrtc/modules/rtp_rtcp/include/rtp_header_parser.h"
 
 namespace webrtc {
+class CongestionController;
 class RemoteBitrateEstimator;
 
 namespace voe {
@@ -27,7 +28,7 @@ namespace internal {
 
 class AudioReceiveStream final : public webrtc::AudioReceiveStream {
  public:
-  AudioReceiveStream(RemoteBitrateEstimator* remote_bitrate_estimator,
+  AudioReceiveStream(CongestionController* congestion_controller,
                      const webrtc::AudioReceiveStream::Config& config,
                      const rtc::scoped_refptr<webrtc::AudioState>& audio_state);
   ~AudioReceiveStream() override;
@@ -52,7 +53,7 @@ class AudioReceiveStream final : public webrtc::AudioReceiveStream {
   VoiceEngine* voice_engine() const;
 
   rtc::ThreadChecker thread_checker_;
-  RemoteBitrateEstimator* const remote_bitrate_estimator_;
+  RemoteBitrateEstimator* remote_bitrate_estimator_ = nullptr;
   const webrtc::AudioReceiveStream::Config config_;
   rtc::scoped_refptr<webrtc::AudioState> audio_state_;
   rtc::scoped_ptr<RtpHeaderParser> rtp_header_parser_;