[Chromoting] Add DataChannelManager to manage optional incoming data channels

remoting/protocol/webrtc_data_stream_adapter.h

Index: remoting/protocol/webrtc_data_stream_adapter.h
diff --git a/remoting/protocol/webrtc_data_stream_adapter.h b/remoting/protocol/webrtc_data_stream_adapter.h
index bb2a2278208d6f8ecc4d7635b74395c7b915b7af..51a7825b07ca89726dce69ce2f234197e75eebc2 100644
--- a/remoting/protocol/webrtc_data_stream_adapter.h
+++ b/remoting/protocol/webrtc_data_stream_adapter.h
@@ -39,10 +39,6 @@ class WebrtcDataStreamAdapter : public MessagePipe,
   void OnStateChange() override;
   void OnMessage(const webrtc::DataBuffer& buffer) override;
 
-  void OnConnected();
-
-  void OnClosed();
-
   rtc::scoped_refptr<webrtc::DataChannelInterface> channel_;
 
   EventHandler* event_handler_ = nullptr;