chrome: Cleanup class/struct forward declarations

chrome/browser/ui/webui/settings/reset_settings_handler.h

 // Copyright 2013 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_UI_WEBUI_SETTINGS_RESET_SETTINGS_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SETTINGS_RESET_SETTINGS_HANDLER_H_
 
 #include <memory>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "build/build_config.h"
 #include "chrome/browser/profile_resetter/profile_reset_report.pb.h"
 #include "chrome/browser/ui/webui/settings/settings_page_ui_handler.h"
 
 namespace base {
-class DictionaryValue;
 class ListValue;
 }  // namespace base
 
 namespace content {
 class WebUIDataSource;
 }
 
 class BrandcodeConfigFetcher;
 class Profile;
 class ProfileResetter;
@@ skipping 82 matching lines @@
   std::string brandcode_;
 
   base::WeakPtrFactory<ResetSettingsHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ResetSettingsHandler);
 };
 
 }  // namespace settings
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_RESET_SETTINGS_HANDLER_H_