Mark template class RefCountedObject as final.

pc/peerconnection.cc

Index: pc/peerconnection.cc
diff --git a/pc/peerconnection.cc b/pc/peerconnection.cc
index 91d0c90a12b2e729de5138c7a95f04e62b8a852e..d5110acc45d33ce97bf43bdb98e901c6b17c2a29 100644
--- a/pc/peerconnection.cc
+++ b/pc/peerconnection.cc
@@ -621,8 +621,9 @@ rtc::scoped_refptr<RtpSenderInterface> PeerConnection::AddTrack(
   if (track->kind() == MediaStreamTrackInterface::kAudioKind) {
     new_sender = RtpSenderProxyWithInternal<RtpSenderInternal>::Create(
         signaling_thread(),
-        new AudioRtpSender(static_cast<AudioTrackInterface*>(track),
-                           session_->voice_channel(), stats_.get()));
+        new rtc::RefCountedObject<AudioRtpSender>(
+            static_cast<AudioTrackInterface*>(track),
+            session_->voice_channel(), stats_.get()));
     if (!streams.empty()) {
       new_sender->internal()->set_stream_id(streams[0]->label());
     }
@@ -634,8 +635,9 @@ rtc::scoped_refptr<RtpSenderInterface> PeerConnection::AddTrack(
   } else if (track->kind() == MediaStreamTrackInterface::kVideoKind) {
     new_sender = RtpSenderProxyWithInternal<RtpSenderInternal>::Create(
         signaling_thread(),
-        new VideoRtpSender(static_cast<VideoTrackInterface*>(track),
-                           session_->video_channel()));
+        new rtc::RefCountedObject<VideoRtpSender>(
+            static_cast<VideoTrackInterface*>(track),
+            session_->video_channel()));
     if (!streams.empty()) {
       new_sender->internal()->set_stream_id(streams[0]->label());
     }
@@ -702,10 +704,12 @@ rtc::scoped_refptr<RtpSenderInterface> PeerConnection::CreateSender(
   if (kind == MediaStreamTrackInterface::kAudioKind) {
     new_sender = RtpSenderProxyWithInternal<RtpSenderInternal>::Create(
         signaling_thread(),
-        new AudioRtpSender(session_->voice_channel(), stats_.get()));
+        new rtc::RefCountedObject<AudioRtpSender>(
+            session_->voice_channel(), stats_.get()));
   } else if (kind == MediaStreamTrackInterface::kVideoKind) {
     new_sender = RtpSenderProxyWithInternal<RtpSenderInternal>::Create(
-        signaling_thread(), new VideoRtpSender(session_->video_channel()));
+        signaling_thread(), new rtc::RefCountedObject<VideoRtpSender>(
+                                session_->video_channel()));
   } else {
     LOG(LS_ERROR) << "CreateSender called with invalid kind: " << kind;
     return new_sender;
@@ -1422,7 +1426,8 @@ void PeerConnection::CreateAudioReceiver(MediaStreamInterface* stream,
   rtc::scoped_refptr<RtpReceiverProxyWithInternal<RtpReceiverInternal>>
       receiver = RtpReceiverProxyWithInternal<RtpReceiverInternal>::Create(
           signaling_thread(),
-          new AudioRtpReceiver(track_id, ssrc, session_->voice_channel()));
+          new rtc::RefCountedObject<AudioRtpReceiver>(
+              track_id, ssrc, session_->voice_channel()));
   stream->AddTrack(
       static_cast<AudioTrackInterface*>(receiver->internal()->track().get()));
   receivers_.push_back(receiver);
@@ -1437,8 +1442,9 @@ void PeerConnection::CreateVideoReceiver(MediaStreamInterface* stream,
   rtc::scoped_refptr<RtpReceiverProxyWithInternal<RtpReceiverInternal>>
       receiver = RtpReceiverProxyWithInternal<RtpReceiverInternal>::Create(
           signaling_thread(),
-          new VideoRtpReceiver(track_id, factory_->worker_thread(), ssrc,
-                               session_->video_channel()));
+          new rtc::RefCountedObject<VideoRtpReceiver>(
+              track_id, factory_->worker_thread(), ssrc,
+              session_->video_channel()));
   stream->AddTrack(
       static_cast<VideoTrackInterface*>(receiver->internal()->track().get()));
   receivers_.push_back(receiver);
@@ -1475,8 +1481,9 @@ void PeerConnection::AddAudioTrack(AudioTrackInterface* track,
   rtc::scoped_refptr<RtpSenderProxyWithInternal<RtpSenderInternal>> new_sender =
       RtpSenderProxyWithInternal<RtpSenderInternal>::Create(
           signaling_thread(),
-          new AudioRtpSender(track, {stream->label()},
-                             session_->voice_channel(), stats_.get()));
+          new rtc::RefCountedObject<AudioRtpSender>(
+              track, std::vector<std::string>({stream->label()}),
+              session_->voice_channel(), stats_.get()));
   senders_.push_back(new_sender);
   // If the sender has already been configured in SDP, we call SetSsrc,
   // which will connect the sender to the underlying transport. This can
@@ -1520,8 +1527,10 @@ void PeerConnection::AddVideoTrack(VideoTrackInterface* track,
   // Normal case; we've never seen this track before.
   rtc::scoped_refptr<RtpSenderProxyWithInternal<RtpSenderInternal>> new_sender =
       RtpSenderProxyWithInternal<RtpSenderInternal>::Create(
-          signaling_thread(), new VideoRtpSender(track, {stream->label()},
-                                                 session_->video_channel()));
+          signaling_thread(), new rtc::RefCountedObject<VideoRtpSender>(
+                                  track,
+                                  std::vector<std::string>({stream->label()}),
+                                  session_->video_channel()));
   senders_.push_back(new_sender);
   const TrackInfo* track_info =
       FindTrackInfo(local_video_tracks_, stream->label(), track->id());