Remove NOTIFICATION_SYSTEM_SETTING_CHANGED, switch CrosSettings to base::CallbackRegistry.

chrome/browser/chromeos/login/wallpaper_manager.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_CHROMEOS_LOGIN_WALLPAPER_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_WALLPAPER_MANAGER_H_
 
 #include <string>
 
 #include "ash/desktop_background/desktop_background_controller.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted_memory.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/time/time.h"
 #include "chrome/browser/chromeos/login/user.h"
 #include "chrome/browser/chromeos/login/user_image.h"
 #include "chrome/browser/chromeos/login/user_image_loader.h"
+#include "chrome/browser/chromeos/settings/cros_settings.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "third_party/icu/source/i18n/unicode/timezone.h"
 #include "ui/gfx/image/image_skia.h"
 
 class CommandLine;
 class PrefRegistrySimple;
 
 namespace base {
 class SequencedTaskRunner;
@@ skipping 319 matching lines @@
   CommandLine* command_line_for_testing_;
 
   // Caches wallpapers of users. Accessed only on UI thread.
   CustomWallpaperMap wallpaper_cache_;
 
   // The last selected user on user pod row.
   std::string last_selected_user_;
 
   bool should_cache_wallpaper_;
 
+  scoped_ptr<CrosSettings::ObserverSubscription>
+      show_user_name_on_signin_subscription_;
+
   base::WeakPtrFactory<WallpaperManager> weak_factory_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(WallpaperManager);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_WALLPAPER_MANAGER_H_