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

webrtc/api/peerconnectionfactory_unittest.cc

Index: webrtc/api/peerconnectionfactory_unittest.cc
diff --git a/webrtc/api/peerconnectionfactory_unittest.cc b/webrtc/api/peerconnectionfactory_unittest.cc
index 833242a240ea6d725196bc39d7efdc3466eef825..fb0d98a62ff475db440b9f1daaf2aec6ef9a6416 100644
--- a/webrtc/api/peerconnectionfactory_unittest.cc
+++ b/webrtc/api/peerconnectionfactory_unittest.cc
@@ -69,9 +69,11 @@ class NullPeerConnectionObserver : public PeerConnectionObserver {
   virtual void OnSignalingMessage(const std::string& msg) {}
   virtual void OnSignalingChange(
       PeerConnectionInterface::SignalingState new_state) {}
-  virtual void OnAddStream(MediaStreamInterface* stream) {}
-  virtual void OnRemoveStream(MediaStreamInterface* stream) {}
-  virtual void OnDataChannel(DataChannelInterface* data_channel) {}
+  virtual void OnAddStream(rtc::scoped_refptr<MediaStreamInterface> stream) {}
+  virtual void OnRemoveStream(rtc::scoped_refptr<MediaStreamInterface> stream) {
+  }
+  virtual void OnDataChannel(
+      rtc::scoped_refptr<DataChannelInterface> data_channel) {}
   virtual void OnRenegotiationNeeded() {}
   virtual void OnIceConnectionChange(
       PeerConnectionInterface::IceConnectionState new_state) {}