Revert of [Chromoting] Add DataChannelManager to manage optional incoming data channels

remoting/protocol/named_message_pipe_handler.h

-// Copyright 2017 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_NAMED_MESSAGE_PIPE_HANDLER_H_
-#define REMOTING_PROTOCOL_NAMED_MESSAGE_PIPE_HANDLER_H_
-
-#include <memory>
-#include <string>
-
-#include "base/callback.h"
-#include "base/sequenced_task_runner_helpers.h"
-#include "base/threading/thread_checker.h"
-#include "remoting/protocol/message_pipe.h"
-
-namespace google {
-namespace protobuf {
-class MessageLite;
-}  // namespace protobuf
-}  // namespace google
-
-namespace remoting {
-
-class CompoundBuffer;
-
-namespace protocol {
-
-// A base class to handle data from a named MessagePipe. This class manages the
-// lifetime itself: it deletes itself once the MessagePipe is closed or the
-// derived instance actively calls Close() function.
-class NamedMessagePipeHandler : public MessagePipe::EventHandler {
- protected:
-  // The callers should create instances of derived classes instead of this
-  // class. So hide the constructor.
-  NamedMessagePipeHandler(const std::string& name,
-                          std::unique_ptr<MessagePipe> pipe);
-
-  ~NamedMessagePipeHandler() override;
-
-  // Closes the channel and eventually destructs this instance. No operations
-  // should be performed after executing this function.
-  void Close();
-
-  const std::string& pipe_name() const { return name_; }
-
-  // Whether |pipe_| has been connected.
-  bool connected() const { return is_connected_; }
-
-  // Sends the message through the pipe. This function should only be called
-  // once connected() returns true.
-  void Send(google::protobuf::MessageLite* message, const base::Closure& done);
-
-  // Derived classes can override these functions to receive data from the
-  // connection or observe the connection state. These functions will not be
-  // called unless |pipe_| has been opened.
-  virtual void OnIncomingMessage(std::unique_ptr<CompoundBuffer> message);
-  virtual void OnConnected();
-  virtual void OnDisconnecting();
-
- private:
-  friend class base::DeleteHelper<NamedMessagePipeHandler>;
-
-  // MessagePipe::EventHandler implementation.
-  void OnMessagePipeOpen() override;
-  void OnMessageReceived(std::unique_ptr<CompoundBuffer> message) override;
-  void OnMessagePipeClosed() override;
-
-  const std::string name_;
-  std::unique_ptr<MessagePipe> pipe_;
-  base::ThreadChecker thread_checker_;
-  bool is_connected_ = false;
-};
-
-}  // namespace protocol
-}  // namespace remoting
-
-#endif  // REMOTING_PROTOCOL_NAMED_MESSAGE_PIPE_HANDLER_H_