Mark template class RefCountedObject as final.

pc/rtpsender.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 59 matching lines @@
   // cricket::AudioSource implementation.
   void SetSink(cricket::AudioSource::Sink* sink) override;
 
   cricket::AudioSource::Sink* sink_;
   // Critical section protecting |sink_|.
   rtc::CriticalSection lock_;
 };
 
 class AudioRtpSender : public DtmfProviderInterface,
                        public ObserverInterface,
-                       public rtc::RefCountedObject<RtpSenderInternal> {
+                       public RtpSenderInternal {
  public:
   // StatsCollector provided so that Add/RemoveLocalAudioTrack can be called
   // at the appropriate times.
   // |channel| can be null if one does not exist yet.
   AudioRtpSender(AudioTrackInterface* track,
                  const std::vector<std::string>& stream_id,
                  cricket::VoiceChannel* channel,
                  StatsCollector* stats);
 
   // Randomly generates stream_id.
@@ skipping 78 matching lines @@
   rtc::scoped_refptr<DtmfSenderInterface> dtmf_sender_proxy_;
   uint32_t ssrc_ = 0;
   bool cached_track_enabled_ = false;
   bool stopped_ = false;
 
   // Used to pass the data callback from the |track_| to the other end of
   // cricket::AudioSource.
   std::unique_ptr<LocalAudioSinkAdapter> sink_adapter_;
 };
 
-class VideoRtpSender : public ObserverInterface,
-                       public rtc::RefCountedObject<RtpSenderInternal> {
+class VideoRtpSender : public ObserverInterface, public RtpSenderInternal {
  public:
   // |channel| can be null if one does not exist yet.
   VideoRtpSender(VideoTrackInterface* track,
                  const std::vector<std::string>& stream_id,
                  cricket::VideoChannel* channel);
 
   // Randomly generates stream_id.
   // |channel| can be null if one does not exist yet.
   VideoRtpSender(VideoTrackInterface* track, cricket::VideoChannel* channel);
 
@@ skipping 61 matching lines @@
   uint32_t ssrc_ = 0;
   bool cached_track_enabled_ = false;
   VideoTrackInterface::ContentHint cached_track_content_hint_ =
       VideoTrackInterface::ContentHint::kNone;
   bool stopped_ = false;
 };
 
 }  // namespace webrtc
 
 #endif  // PC_RTPSENDER_H_