Simplify adding callbacks.

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

 // Copyright (c) 2011 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_NETWORK_DROPDOWN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_NETWORK_DROPDOWN_HANDLER_H_
 
+#include <string>
+
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/ui/webui/chromeos/login/base_screen_handler.h"
 
 namespace chromeos {
 
 class NetworkDropdown;
 
 class NetworkDropdownHandler : public BaseScreenHandler {
  public:
   NetworkDropdownHandler();
   virtual ~NetworkDropdownHandler();
 
   // BaseScreenHandler implementation:
   virtual void DeclareLocalizedValues(LocalizedValuesBuilder* builder) OVERRIDE;
   virtual void Initialize() OVERRIDE;
 
   // WebUIMessageHandler implementation:
   virtual void RegisterMessages() OVERRIDE;
 
  private:
   // Handles choosing of the network menu item.
-  void HandleNetworkItemChosen(const base::ListValue* args);
+  void HandleNetworkItemChosen(double id);
   // Handles network drop-down showing.
-  void HandleNetworkDropdownShow(const base::ListValue* args);
+  void HandleNetworkDropdownShow(const std::string& element_id,
+                                 bool oobe,
+                                 double last_network_type);
   // Handles network drop-down hiding.
-  void HandleNetworkDropdownHide(const base::ListValue* args);
+  void HandleNetworkDropdownHide();
   // Handles network drop-down refresh.
-  void HandleNetworkDropdownRefresh(const base::ListValue* args);
+  void HandleNetworkDropdownRefresh();
 
   scoped_ptr<NetworkDropdown> dropdown_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkDropdownHandler);
 };
 
 }  // namespace chromeos
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_NETWORK_DROPDOWN_HANDLER_H_