Make BrowserMessageFilter support dispatching messages on different threads.

chrome/browser/browser_io_message_filter.h

Index: chrome/browser/browser_io_message_filter.h
===================================================================
--- chrome/browser/browser_io_message_filter.h	(revision 68741)
+++ chrome/browser/browser_io_message_filter.h	(working copy)
@@ -1,40 +0,0 @@
-// Copyright (c) 2010 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 CHROME_BROWSER_BROWSER_IO_MESSAGE_FILTER_H_
-#define CHROME_BROWSER_BROWSER_IO_MESSAGE_FILTER_H_
-#pragma once
-
-#include "base/process.h"
-#include "ipc/ipc_channel_proxy.h"
-
-// Base class for message filters in the browser process that reside on the IO
-// thread.
-class BrowserIOMessageFilter : public IPC::ChannelProxy::MessageFilter,
-                               public IPC::Message::Sender {
- public:
-  BrowserIOMessageFilter();
-  virtual ~BrowserIOMessageFilter();
-
-  // IPC::ChannelProxy::MessageFilter methods.  If you override them, make sure
-  // to call them as well.
-  virtual void OnFilterAdded(IPC::Channel* channel);
-  virtual void OnChannelClosing();
-  virtual void OnChannelConnected(int32 peer_pid);
-
-  // IPC::Message::Sender implementation:
-  virtual bool Send(IPC::Message* msg);
-
- protected:
-  base::ProcessHandle peer_handle() { return peer_handle_; }
-
-  // Call this if a message couldn't be deserialized.  This kills the renderer.
-  void BadMessageReceived(uint32 msg_type);
-
- private:
-  IPC::Channel* channel_;
-  base::ProcessHandle peer_handle_;
-};
-
-#endif  // CHROME_BROWSER_BROWSER_IO_MESSAGE_FILTER_H_