Remove video_channel() from Session interface

remoting/protocol/protobuf_video_writer.h

Index: remoting/protocol/protobuf_video_writer.h
diff --git a/remoting/protocol/protobuf_video_writer.h b/remoting/protocol/protobuf_video_writer.h
index 189eacfce6179e29fc49cec8b837f4a2c98033bf..a5bb4fce296c1b4f2f67053d7b8d16af743e2773 100644
--- a/remoting/protocol/protobuf_video_writer.h
+++ b/remoting/protocol/protobuf_video_writer.h
@@ -5,10 +5,17 @@
 #ifndef REMOTING_PROTOCOL_PROTOBUF_VIDEO_WRITER_H_
 #define REMOTING_PROTOCOL_PROTOBUF_VIDEO_WRITER_H_
 
+#include <string>
+
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
 #include "remoting/protocol/video_writer.h"
 
+namespace net {
+class StreamSocket;
+}  // namespace net
+
 namespace remoting {
 namespace protocol {
 
@@ -21,7 +28,8 @@ class ProtobufVideoWriter : public VideoWriter {
   virtual ~ProtobufVideoWriter();
 
   // VideoWriter interface.
-  virtual void Init(protocol::Session* session) OVERRIDE;
+  virtual void Init(protocol::Session* session,
+                    const InitializedCallback& callback) OVERRIDE;
   virtual void Close() OVERRIDE;
 
   // VideoStub interface.
@@ -30,6 +38,13 @@ class ProtobufVideoWriter : public VideoWriter {
   virtual int GetPendingPackets() OVERRIDE;
 
  private:
+  void OnChannelReady(const std::string& name, net::StreamSocket* socket);
+
+  InitializedCallback initialized_callback_;
+
+  // TODO(sergeyu): Remove |channel_| and let |buffered_writer_| own it.
+  scoped_ptr<net::StreamSocket> channel_;
+
   scoped_refptr<BufferedSocketWriter> buffered_writer_;
 
   DISALLOW_COPY_AND_ASSIGN(ProtobufVideoWriter);