Add MessageChanneFactory interface and use it in ChannelDispatcherBase.

remoting/protocol/webrtc_connection_to_host.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef REMOTING_PROTOCOL_WEBRTC_CONNECTION_TO_HOST_H_
 #define REMOTING_PROTOCOL_WEBRTC_CONNECTION_TO_HOST_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 44 matching lines @@
   void OnWebrtcTransportConnecting() override;
   void OnWebrtcTransportConnected() override;
   void OnWebrtcTransportError(ErrorCode error) override;
   void OnWebrtcTransportMediaStreamAdded(
       scoped_refptr<webrtc::MediaStreamInterface> stream) override;
   void OnWebrtcTransportMediaStreamRemoved(
       scoped_refptr<webrtc::MediaStreamInterface> stream) override;
 
   // ChannelDispatcherBase::EventHandler interface.
   void OnChannelInitialized(ChannelDispatcherBase* channel_dispatcher) override;
-  void OnChannelError(ChannelDispatcherBase* channel_dispatcher,
-                      ErrorCode error) override;
 
   void NotifyIfChannelsReady();
 
   void CloseChannels();
 
   void SetState(State state, ErrorCode error);
 
   HostEventCallback* event_callback_ = nullptr;
 
   // Stub for incoming messages.
@@ skipping 16 matching lines @@
   ErrorCode error_ = OK;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WebrtcConnectionToHost);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_WEBRTC_CONNECTION_TO_HOST_H_