Mark template class RefCountedObject as final.

pc/rtpreceiver.cc

 /*
  *  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 129 matching lines @@
   received_first_packet_ = true;
 }
 
 VideoRtpReceiver::VideoRtpReceiver(const std::string& track_id,
                                    rtc::Thread* worker_thread,
                                    uint32_t ssrc,
                                    cricket::VideoChannel* channel)
     : id_(track_id),
       ssrc_(ssrc),
       channel_(channel),
-      source_(new RefCountedObject<VideoTrackSource>(&broadcaster_,
-                                                     true /* remote */)),
+      source_(new rtc::RefCountedObject<VideoTrackSource>(&broadcaster_,
+                                                          true /* remote */)),
       track_(VideoTrackProxy::Create(
           rtc::Thread::Current(),
           worker_thread,
           VideoTrack::Create(
               track_id,
               VideoTrackSourceProxy::Create(rtc::Thread::Current(),
                                             worker_thread,
                                             source_),
               worker_thread))) {
   source_->SetState(MediaSourceInterface::kLive);
@@ skipping 73 matching lines @@
 }
 
 void VideoRtpReceiver::OnFirstPacketReceived(cricket::BaseChannel* channel) {
   if (observer_) {
     observer_->OnFirstPacketReceived(media_type());
   }
   received_first_packet_ = true;
 }
 
 }  // namespace webrtc