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

webrtc/api/peerconnection_unittest.cc

Index: webrtc/api/peerconnection_unittest.cc
diff --git a/webrtc/api/peerconnection_unittest.cc b/webrtc/api/peerconnection_unittest.cc
index 521486f98b8e8cd79d76148f661eefdfeca46143..06b7e04e6e565b7044972a8a77cdf4f8ab5915e3 100644
--- a/webrtc/api/peerconnection_unittest.cc
+++ b/webrtc/api/peerconnection_unittest.cc
@@ -241,7 +241,8 @@ class PeerConnectionTestClient : public webrtc::PeerConnectionObserver,
       webrtc::PeerConnectionInterface::SignalingState new_state) override {
     EXPECT_EQ(pc()->signaling_state(), new_state);
   }
-  void OnAddStream(MediaStreamInterface* media_stream) override {
+  void OnAddStream(
+      rtc::scoped_refptr<MediaStreamInterface> media_stream) override {
     media_stream->RegisterObserver(this);
     for (size_t i = 0; i < media_stream->GetVideoTracks().size(); ++i) {
       const std::string id = media_stream->GetVideoTracks()[i]->id();
@@ -251,7 +252,8 @@ class PeerConnectionTestClient : public webrtc::PeerConnectionObserver,
           media_stream->GetVideoTracks()[i]));
     }
   }
-  void OnRemoveStream(MediaStreamInterface* media_stream) override {}
+  void OnRemoveStream(
+      rtc::scoped_refptr<MediaStreamInterface> media_stream) override {}
   void OnRenegotiationNeeded() override {}
   void OnIceConnectionChange(
       webrtc::PeerConnectionInterface::IceConnectionState new_state) override {
@@ -425,7 +427,8 @@ class PeerConnectionTestClient : public webrtc::PeerConnectionObserver,
                PeerConnectionInterface::RTCOfferAnswerOptions::kUndefined;
   }
 
-  void OnDataChannel(DataChannelInterface* data_channel) override {
+  void OnDataChannel(
+      rtc::scoped_refptr<DataChannelInterface> data_channel) override {
     LOG(INFO) << id_ << "OnDataChannel";
     data_channel_ = data_channel;
     data_observer_.reset(new MockDataChannelObserver(data_channel));