Simplify adding callbacks.

chrome/browser/ui/webui/chromeos/login/wrong_hwid_screen_handler.h

 // Copyright (c) 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_CHROMEOS_LOGIN_WRONG_HWID_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_WRONG_HWID_SCREEN_HANDLER_H_
 
 #include "base/compiler_specific.h"
 #include "chrome/browser/chromeos/login/screens/wrong_hwid_screen_actor.h"
 #include "chrome/browser/ui/webui/chromeos/login/base_screen_handler.h"
 #include "content/public/browser/web_ui.h"
 
 namespace base {
 class DictionaryValue;
-class ListValue;
 }
 
 namespace chromeos {
 
 // WebUI implementation of WrongHWIDScreenActor.
 class WrongHWIDScreenHandler : public WrongHWIDScreenActor,
                                public BaseScreenHandler {
  public:
   WrongHWIDScreenHandler();
   virtual ~WrongHWIDScreenHandler();
 
   // WrongHWIDScreenActor implementation:
   virtual void PrepareToShow() OVERRIDE;
   virtual void Show() OVERRIDE;
   virtual void Hide() OVERRIDE;
   virtual void SetDelegate(Delegate* delegate) OVERRIDE;
 
   // BaseScreenHandler implementation:
   virtual void DeclareLocalizedValues(LocalizedValuesBuilder* builder) OVERRIDE;
   virtual void Initialize() OVERRIDE;
 
   // WebUIMessageHandler implementation:
   virtual void RegisterMessages() OVERRIDE;
 
  private:
   // JS messages handlers.
-  void HandleOnSkip(const base::ListValue* args);
+  void HandleOnSkip();
 
   Delegate* delegate_;
 
   // Keeps whether screen should be shown right after initialization.
   bool show_on_init_;
 
   DISALLOW_COPY_AND_ASSIGN(WrongHWIDScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_WRONG_HWID_SCREEN_HANDLER_H_