Allow mocking SendSideCongestionController for Call tests.

webrtc/modules/congestion_controller/include/congestion_controller.h

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 40 matching lines @@
 
   CongestionController(const Clock* clock,
                        Observer* observer,
                        RemoteBitrateObserver* /* remote_bitrate_observer */,
                        RtcEventLog* event_log,
                        PacketRouter* packet_router)
       : send_side_cc_(clock, observer, event_log, packet_router),
         receive_side_cc_(clock, packet_router) {}
   CongestionController(const Clock* clock,
                        Observer* observer,
-                       RemoteBitrateObserver* remote_bitrate_observer,
+                       RemoteBitrateObserver* /* remote_bitrate_observer */,
                        RtcEventLog* event_log,
                        PacketRouter* packet_router,
                        std::unique_ptr<PacedSender> pacer)
       : send_side_cc_(clock, observer, event_log, std::move(pacer)),
         receive_side_cc_(clock, packet_router) {}
 
   virtual ~CongestionController() {}
 
   virtual void OnReceivedPacket(int64_t arrival_time_ms,
                                 size_t payload_size,
@@ skipping 60 matching lines @@
  private:
   SendSideCongestionController send_side_cc_;
   ReceiveSideCongestionController receive_side_cc_;
 
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(CongestionController);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_CONGESTION_CONTROLLER_INCLUDE_CONGESTION_CONTROLLER_H_