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

webrtc/api/test/peerconnectiontestwrapper.h

Index: webrtc/api/test/peerconnectiontestwrapper.h
diff --git a/webrtc/api/test/peerconnectiontestwrapper.h b/webrtc/api/test/peerconnectiontestwrapper.h
index 7a9bea46b0d4ef0e2136e841970b87255af036d7..11030914ea69b482393d758507a2757f2df629e9 100644
--- a/webrtc/api/test/peerconnectiontestwrapper.h
+++ b/webrtc/api/test/peerconnectiontestwrapper.h
@@ -42,9 +42,12 @@ class PeerConnectionTestWrapper
      webrtc::PeerConnectionInterface::SignalingState new_state) {}
   virtual void OnStateChange(
       webrtc::PeerConnectionObserver::StateType state_changed) {}
-  virtual void OnAddStream(webrtc::MediaStreamInterface* stream);
-  virtual void OnRemoveStream(webrtc::MediaStreamInterface* stream) {}
-  virtual void OnDataChannel(webrtc::DataChannelInterface* data_channel);
+  virtual void OnAddStream(
+      rtc::scoped_refptr<webrtc::MediaStreamInterface> stream);
+  virtual void OnRemoveStream(
+      rtc::scoped_refptr<webrtc::MediaStreamInterface> stream) {}
+  virtual void OnDataChannel(
+      rtc::scoped_refptr<webrtc::DataChannelInterface> data_channel);
   virtual void OnRenegotiationNeeded() {}
   virtual void OnIceConnectionChange(
       webrtc::PeerConnectionInterface::IceConnectionState new_state) {}