Remove obviously unneeded forward declarations in chrome/browser/[abef]*/*.h.

chrome/browser/automation/extension_port_container.h

 // 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_AUTOMATION_EXTENSION_PORT_CONTAINER_H_
 #define CHROME_BROWSER_AUTOMATION_EXTENSION_PORT_CONTAINER_H_
 #pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/ref_counted.h"
 #include "ipc/ipc_message.h"
 
 class AutomationProvider;
 class ExtensionMessageService;
 class GURL;
 class ListValue;
-class MessageLoop;
 class RenderViewHost;
 
 // This class represents an external port to an extension, opened
 // through the automation interface.
 class ExtensionPortContainer : public IPC::Message::Sender {
  public:
 
   // Intercepts and processes a message posted through the automation interface.
   // Returns true if the message was intercepted.
   static bool InterceptMessageFromExternalHost(const std::string& message,
@@ skipping 49 matching lines @@
 
   // Our assigned port id.
   int port_id_;
   // Handle to our associated tab.
   int tab_handle_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionPortContainer);
 };
 
 #endif  // CHROME_BROWSER_AUTOMATION_EXTENSION_PORT_CONTAINER_H_