chrome: Cleanup class/struct forward declarations

chrome/browser/extensions/api/commands/command_service.h

 // Copyright (c) 2012 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_EXTENSIONS_API_COMMANDS_COMMAND_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_API_COMMANDS_COMMAND_SERVICE_H_
 
 #include <string>
 
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "base/scoped_observer.h"
 #include "chrome/common/extensions/command.h"
 #include "extensions/browser/browser_context_keyed_api_factory.h"
 #include "extensions/browser/extension_registry_observer.h"
 #include "extensions/common/extension.h"
 
 class Profile;
 
-namespace base {
-class DictionaryValue;
-}
-
 namespace content {
 class BrowserContext;
 }
 
 namespace ui {
 class Accelerator;
 }
 
 namespace user_prefs {
 class PrefRegistrySyncable;
@@ skipping 248 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(CommandService);
 };
 
 template <>
 void
     BrowserContextKeyedAPIFactory<CommandService>::DeclareFactoryDependencies();
 
 }  //  namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_COMMANDS_COMMAND_SERVICE_H_