[mojo] Delete RemoteMessagePipeBootstrap

mojo/edk/system/remote_message_pipe_bootstrap.h

-// Copyright 2016 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 MOJO_EDK_SYSTEM_REMOTE_MESSAGE_PIPE_BOOTSTRAP_H_
-#define MOJO_EDK_SYSTEM_REMOTE_MESSAGE_PIPE_BOOTSTRAP_H_
-
-#include <string>
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/message_loop/message_loop.h"
-#include "base/task_runner.h"
-#include "mojo/edk/embedder/scoped_platform_handle.h"
-#include "mojo/edk/system/channel.h"
-#include "mojo/edk/system/ports/name.h"
-#include "mojo/edk/system/ports/port_ref.h"
-
-namespace mojo {
-namespace edk {
-
-class NodeController;
-
-// This is used by Core to negotiate a new cross-process message pipe given
-// an arbitrary platform channel. Both ends of the channel must be passed to
-// RemoteMessagePipeBootstrap::Create() in their respective processes.
-//
-// The bootstrapping procedure the same on either end:
-//
-//   1. Select a local port P to be merged with a remote port.
-//   2. Write the local node name and P's name to the bootstrap pipe.
-//   3. When a message is read from the pipe:
-//      - If it's the first message read, extract the remote node+port name and
-//        and send an empty ACK message on the pipe.
-//      - If it's the second message read, close the channel, and delete |this|.
-//   4. When an error occus on the pipe, delete |this|.
-//
-// Excluding irrecoverable error conditions such as either process dying,
-// armageddon, etc., this ensures neither end closes the channel until both ends
-// are aware of each other's port-to-merge.
-//
-// At step 3, one side of the channel is chosen to issue a message at the Ports
-// layer which eventually merges the two ports.
-class RemoteMessagePipeBootstrap
-    : public Channel::Delegate,
-      public base::MessageLoop::DestructionObserver {
- public:
-  ~RemoteMessagePipeBootstrap() override;
-
-  // |port| must be a reference to an uninitialized local port.
-  static void Create(NodeController* node_controller,
-                     ScopedPlatformHandle platform_handle,
-                     const ports::PortRef& port);
-
- protected:
-  explicit RemoteMessagePipeBootstrap(NodeController* node_controller,
-                                      ScopedPlatformHandle platform_handle,
-                                      const ports::PortRef& port);
-
-  void ShutDown();
-
-  bool shutting_down_ = false;
-  NodeController* node_controller_;
-  const ports::PortRef local_port_;
-
-  scoped_refptr<base::TaskRunner> io_task_runner_;
-  scoped_refptr<Channel> channel_;
-
-  bool peer_info_received_ = false;
-
- private:
-  // base::MessageLoop::DestructionObserver:
-  void WillDestroyCurrentMessageLoop() override;
-
-  // Channel::Delegate:
-  void OnChannelMessage(const void* payload,
-                        size_t payload_size,
-                        ScopedPlatformHandleVectorPtr handles) override;
-  void OnChannelError() override;
-
-  void ShutDownNow();
-
-  DISALLOW_COPY_AND_ASSIGN(RemoteMessagePipeBootstrap);
-};
-
-}  // namespace edk
-}  // namespace mojo
-
-#endif  // MOJO_EDK_SYSTEM_REMOTE_MESSAGE_PIPE_BOOTSTRAP_H_