Change return type of CongestionController::pacer() method.

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 1fcb03dd57f0fd74ed6dca6ceac644a82c336bc9..fa44a9b974fedba5cf31a9660f9345e70ec7a0df 100644
--- a/webrtc/modules/congestion_controller/include/congestion_controller.h
+++ b/webrtc/modules/congestion_controller/include/congestion_controller.h
@@ -87,9 +87,9 @@ class CongestionController : public CallStatsObserver, public Module {
   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.
-  virtual PacedSender* pacer() { return pacer_.get(); }
+  // TODO(nisse): Rename or delete this accessor function. The pacer
+  // should be internal to the congestion controller.
+  virtual RtpPacketSender* pacer() { return pacer_.get(); }
   virtual TransportFeedbackObserver* GetTransportFeedbackObserver();
   RateLimiter* GetRetransmissionRateLimiter();
   void EnablePeriodicAlrProbing(bool enable);