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

webrtc/examples/peerconnection/client/conductor.h

Index: webrtc/examples/peerconnection/client/conductor.h
diff --git a/webrtc/examples/peerconnection/client/conductor.h b/webrtc/examples/peerconnection/client/conductor.h
index db2f77b6464236d4f1c9cdf235a56ee6bbfb8846..045b01387b9221c0f82a5cd97991a7b548177086 100644
--- a/webrtc/examples/peerconnection/client/conductor.h
+++ b/webrtc/examples/peerconnection/client/conductor.h
@@ -67,9 +67,12 @@ class Conductor
 
   void OnSignalingChange(
       webrtc::PeerConnectionInterface::SignalingState new_state) override{};
-  void OnAddStream(webrtc::MediaStreamInterface* stream) override;
-  void OnRemoveStream(webrtc::MediaStreamInterface* stream) override;
-  void OnDataChannel(webrtc::DataChannelInterface* channel) override {}
+  void OnAddStream(
+      rtc::scoped_refptr<webrtc::MediaStreamInterface> stream) override;
+  void OnRemoveStream(
+      rtc::scoped_refptr<webrtc::MediaStreamInterface> stream) override;
+  void OnDataChannel(
+      rtc::scoped_refptr<webrtc::DataChannelInterface> channel) override {}
   void OnRenegotiationNeeded() override {}
   void OnIceConnectionChange(
       webrtc::PeerConnectionInterface::IceConnectionState new_state) override{};