Remove event_channel() and control_channel() from Session interface.

remoting/protocol/video_reader.h

 // Copyright (c) 2011 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.
 
 // VideoReader is a generic interface for a video stream reader. RtpVideoReader
 // and ProtobufVideoReader implement this interface for RTP and protobuf video
 // streams. VideoReader is used by ConnectionToHost to read video stream.
 
 #ifndef REMOTING_PROTOCOL_VIDEO_READER_H_
 #define REMOTING_PROTOCOL_VIDEO_READER_H_
@@ skipping 20 matching lines @@
   // parameter is set to true on success.
   typedef base::Callback<void(bool)> InitializedCallback;
 
   virtual ~VideoReader();
 
   // Initializies the reader. Doesn't take ownership of either |connection|
   // or |video_stub|.
   virtual void Init(Session* session,
                     VideoStub* video_stub,
                     const InitializedCallback& callback) = 0;
+  virtual bool is_connected() = 0;
 
  protected:
   VideoReader() { }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(VideoReader);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_VIDEO_READER_H_