Remove NOTIFICATION_SYSTEM_SETTING_CHANGED, switch CrosSettings to base::CallbackRegistry.

chrome/browser/ui/webui/chromeos/login/signin_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_SIGNIN_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_
 
 #include <set>
 #include <string>
 
 #include "base/callback.h"
 #include "base/containers/hash_tables.h"
 #include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/chromeos/login/help_app_launcher.h"
 #include "chrome/browser/chromeos/login/login_display.h"
 #include "chrome/browser/chromeos/login/screens/error_screen_actor.h"
 #include "chrome/browser/chromeos/login/user_manager.h"
 #include "chrome/browser/chromeos/net/network_portal_detector.h"
+#include "chrome/browser/chromeos/settings/cros_settings.h"
 #include "chrome/browser/chromeos/system_key_event_listener.h"
 #include "chrome/browser/ui/webui/chromeos/login/base_screen_handler.h"
 #include "chrome/browser/ui/webui/chromeos/login/network_state_informer.h"
 #include "chrome/browser/ui/webui/chromeos/login/oobe_ui.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_ui.h"
 #include "net/base/net_errors.h"
 
 namespace base {
@@ skipping 241 matching lines @@
 
   // Tells webui to load authentication extension. |force| is used to force the
   // extension reloading, if it has already been loaded. |silent_load| is true
   // for cases when extension should be loaded in the background and it
   // shouldn't grab the focus. |offline| is true when offline version of the
   // extension should be used.
   void LoadAuthExtension(bool force, bool silent_load, bool offline);
 
   // Updates authentication extension. Called when device settings that affect
   // sign-in (allow BWSI and allow whitelist) are changed.
+  void UserSettingsChanged();
   void UpdateAuthExtension();
   void UpdateAddButtonStatus();
 
   // Fill |params| that are passed to JS..
   void UpdateAuthParams(DictionaryValue* params);
 
   // Restore input focus to current user pod.
   void RefocusCurrentPod();
 
   // WebUI message handlers.
@@ skipping 170 matching lines @@
   base::CancelableClosure update_state_closure_;
   base::CancelableClosure connecting_closure_;
 
   content::NotificationRegistrar registrar_;
 
   // Whether there is an auth UI pending. This flag is set on receiving
   // NOTIFICATION_AUTH_NEEDED and reset on either NOTIFICATION_AUTH_SUPPLIED or
   // NOTIFICATION_AUTH_CANCELLED.
   bool has_pending_auth_ui_;
 
+  scoped_ptr<CrosSettings::ObserverSubscription> allow_new_user_subscription_;
+  scoped_ptr<CrosSettings::ObserverSubscription> allow_guest_subscription_;
+
   DISALLOW_COPY_AND_ASSIGN(SigninScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_