Use scoped_refptr for On(Add|Remove)Stream and OnDataChannel.

webrtc/api/test/peerconnectiontestwrapper.cc

 /*
  *  Copyright 2013 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 74 matching lines @@
   return peer_connection_.get() != NULL;
 }
 
 rtc::scoped_refptr<webrtc::DataChannelInterface>
 PeerConnectionTestWrapper::CreateDataChannel(
     const std::string& label,
     const webrtc::DataChannelInit& init) {
   return peer_connection_->CreateDataChannel(label, &init);
 }
 
-void PeerConnectionTestWrapper::OnAddStream(MediaStreamInterface* stream) {
+void PeerConnectionTestWrapper::OnAddStream(
+    rtc::scoped_refptr<MediaStreamInterface> stream) {
   LOG(LS_INFO) << "PeerConnectionTestWrapper " << name_
                << ": OnAddStream";
   // TODO(ronghuawu): support multiple streams.
   if (stream->GetVideoTracks().size() > 0) {
     renderer_.reset(new FakeVideoTrackRenderer(stream->GetVideoTracks()[0]));
   }
 }
 
 void PeerConnectionTestWrapper::OnIceCandidate(
     const IceCandidateInterface* candidate) {
   std::string sdp;
   EXPECT_TRUE(candidate->ToString(&sdp));
   // Give the user a chance to modify sdp for testing.
   SignalOnIceCandidateCreated(&sdp);
   SignalOnIceCandidateReady(candidate->sdp_mid(), candidate->sdp_mline_index(),
                             sdp);
 }
 
 void PeerConnectionTestWrapper::OnDataChannel(
-    webrtc::DataChannelInterface* data_channel) {
+    rtc::scoped_refptr<webrtc::DataChannelInterface> data_channel) {
   SignalOnDataChannel(data_channel);
 }
 
 void PeerConnectionTestWrapper::OnSuccess(SessionDescriptionInterface* desc) {
   // This callback should take the ownership of |desc|.
   std::unique_ptr<SessionDescriptionInterface> owned_desc(desc);
   std::string sdp;
   EXPECT_TRUE(desc->ToString(&sdp));
 
   LOG(LS_INFO) << "PeerConnectionTestWrapper " << name_
@@ skipping 145 matching lines @@
         peer_connection_factory_->CreateVideoSource(
             new webrtc::FakePeriodicVideoCapturer(), &constraints);
     std::string videotrack_label = label + kVideoTrackLabelBase;
     rtc::scoped_refptr<webrtc::VideoTrackInterface> video_track(
         peer_connection_factory_->CreateVideoTrack(videotrack_label, source));
 
     stream->AddTrack(video_track);
   }
   return stream;
 }