Support REMB in combination with send-side BWE.

webrtc/call/congestion_controller.cc

Index: webrtc/call/congestion_controller.cc
diff --git a/webrtc/call/congestion_controller.cc b/webrtc/call/congestion_controller.cc
index 4030f8e75b9291fee257da970f8decfff8f446c3..0267d79fca11f43a5cbb1dffcd733e393dff3fc4 100644
--- a/webrtc/call/congestion_controller.cc
+++ b/webrtc/call/congestion_controller.cc
@@ -237,8 +237,7 @@ TransportFeedbackObserver*
 CongestionController::GetTransportFeedbackObserver() {
   if (transport_feedback_adapter_.get() == nullptr) {
     transport_feedback_adapter_.reset(new TransportFeedbackAdapter(
-        bitrate_controller_->CreateRtcpBandwidthObserver(),
-        Clock::GetRealTimeClock(), process_thread_));
+        bitrate_controller_.get(), Clock::GetRealTimeClock(), process_thread_));
     transport_feedback_adapter_->SetBitrateEstimator(
         new RemoteBitrateEstimatorAbsSendTime(
             transport_feedback_adapter_.get(), Clock::GetRealTimeClock()));