chrome: Cleanup class/struct forward declarations

chrome/browser/renderer_host/chrome_extension_message_filter.h

 // Copyright 2014 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_RENDERER_HOST_CHROME_EXTENSION_MESSAGE_FILTER_H_
 #define CHROME_BROWSER_RENDERER_HOST_CHROME_EXTENSION_MESSAGE_FILTER_H_
 
 #include <string>
 
 #include "base/macros.h"
 #include "base/sequenced_task_runner_helpers.h"
 #include "content/public/browser/browser_message_filter.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
-class GURL;
 class Profile;
 struct ExtensionHostMsg_APIActionOrEvent_Params;
 struct ExtensionHostMsg_DOMAction_Params;
 struct ExtensionMsg_ExternalConnectionInfo;
 struct ExtensionMsg_TabTargetConnectionInfo;
 
-namespace base {
-class FilePath;
-}
-
 namespace extensions {
 class ActivityLog;
 class InfoMap;
 struct Message;
 }
 
 // This class filters out incoming Chrome-specific IPC messages from the
 // extension process on the IPC thread.
 class ChromeExtensionMessageFilter : public content::BrowserMessageFilter,
                                      public content::NotificationObserver {
@@ skipping 94 matching lines @@
   extensions::ActivityLog* activity_log_;
 
   scoped_refptr<extensions::InfoMap> extension_info_map_;
 
   content::NotificationRegistrar notification_registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeExtensionMessageFilter);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_CHROME_EXTENSION_MESSAGE_FILTER_H_