Mark template class RefCountedObject as final.

pc/rtpreceiver.h

 /*
  *  Copyright 2015 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 23 matching lines @@
 class RtpReceiverInternal : public RtpReceiverInterface {
  public:
   virtual void Stop() = 0;
   // This SSRC is used as an identifier for the receiver between the API layer
   // and the WebRtcVideoEngine, WebRtcVoiceEngine layer.
   virtual uint32_t ssrc() const = 0;
 };
 
 class AudioRtpReceiver : public ObserverInterface,
                          public AudioSourceInterface::AudioObserver,
-                         public rtc::RefCountedObject<RtpReceiverInternal>,
+                         public RtpReceiverInternal,
                          public sigslot::has_slots<> {
  public:
   // An SSRC of 0 will create a receiver that will match the first SSRC it
   // sees.
   // TODO(deadbeef): Use rtc::Optional, or have another constructor that
   // doesn't take an SSRC, and make this one DCHECK(ssrc != 0).
   AudioRtpReceiver(const std::string& track_id,
                    uint32_t ssrc,
                    cricket::VoiceChannel* channel);
 
@@ skipping 43 matching lines @@
   const uint32_t ssrc_;
   cricket::VoiceChannel* channel_;
   const rtc::scoped_refptr<AudioTrackInterface> track_;
   bool cached_track_enabled_;
   double cached_volume_ = 1;
   bool stopped_ = false;
   RtpReceiverObserverInterface* observer_ = nullptr;
   bool received_first_packet_ = false;
 };
 
-class VideoRtpReceiver : public rtc::RefCountedObject<RtpReceiverInternal>,
+class VideoRtpReceiver : public RtpReceiverInternal,
                          public sigslot::has_slots<> {
  public:
   // An SSRC of 0 will create a receiver that will match the first SSRC it
   // sees.
   VideoRtpReceiver(const std::string& track_id,
                    rtc::Thread* worker_thread,
                    uint32_t ssrc,
                    cricket::VideoChannel* channel);
 
   virtual ~VideoRtpReceiver();
@@ skipping 41 matching lines @@
   rtc::scoped_refptr<VideoTrackSource> source_;
   rtc::scoped_refptr<VideoTrackInterface> track_;
   bool stopped_ = false;
   RtpReceiverObserverInterface* observer_ = nullptr;
   bool received_first_packet_ = false;
 };
 
 }  // namespace webrtc
 
 #endif  // PC_RTPRECEIVER_H_