chrome: Cleanup class/struct forward declarations

chrome/browser/ui/webui/options/chromeos/internet_options_handler.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_UI_WEBUI_OPTIONS_CHROMEOS_INTERNET_OPTIONS_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS_CHROMEOS_INTERNET_OPTIONS_HANDLER_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/ui/webui/options/options_ui.h"
 #include "ui/gfx/native_widget_types.h"
 
-class Browser;
 class PrefService;
 
-namespace gfx {
-class ImageSkia;
-}
-
-namespace views {
-class WidgetDelegate;
-}
-
 namespace chromeos {
 namespace options {
 
 // ChromeOS internet options page UI handler.
 class InternetOptionsHandler : public ::options::OptionsPageUIHandler {
  public:
   InternetOptionsHandler();
   ~InternetOptionsHandler() override;
 
  private:
@@ skipping 23 matching lines @@
   // of this object.
   base::WeakPtrFactory<InternetOptionsHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(InternetOptionsHandler);
 };
 
 }  // namespace options
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_CHROMEOS_INTERNET_OPTIONS_HANDLER_H_