Move PacedSender ownership to RtpTransportControllerSend.

webrtc/modules/congestion_controller/include/congestion_controller.h

Index: webrtc/modules/congestion_controller/include/congestion_controller.h
diff --git a/webrtc/modules/congestion_controller/include/congestion_controller.h b/webrtc/modules/congestion_controller/include/congestion_controller.h
index ce9fbc58b01532069875851e33c5b5eff4fe5573..69d0810f4a805c965fda51fede42bdcb1df0c7be 100644
--- a/webrtc/modules/congestion_controller/include/congestion_controller.h
+++ b/webrtc/modules/congestion_controller/include/congestion_controller.h
@@ -49,20 +49,13 @@ class CongestionController : public CallStatsObserver,
  public:
   using Observer = SendSideCongestionController::Observer;
 
-  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 */,
                        RtcEventLog* event_log,
                        PacketRouter* packet_router,
-                       std::unique_ptr<PacedSender> pacer)
-      : send_side_cc_(clock, observer, event_log, std::move(pacer)),
+                       PacedSender* pacer)
+      : send_side_cc_(clock, observer, event_log, pacer),
         receive_side_cc_(clock, packet_router) {}
 
   virtual ~CongestionController() {}
@@ -87,10 +80,6 @@ class CongestionController : public CallStatsObserver,
   virtual RemoteBitrateEstimator* GetRemoteBitrateEstimator(
       bool send_side_bwe);
   virtual int64_t GetPacerQueuingDelayMs() const;
-  // TODO(nisse): Delete this accessor function. The pacer should be
-  // internal to the congestion controller. Currently needed by Call,
-  // to register the pacer module on the right thread.
-  virtual PacedSender* pacer() { return send_side_cc_.pacer(); }
   // TODO(nisse): Delete this method, as soon as downstream projects
   // are updated.
   virtual TransportFeedbackObserver* GetTransportFeedbackObserver() {