Restore to user selected wallpaper after browser crash

chrome/browser/chromeos/background/desktop_background_observer.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_CHROMEOS_BACKGROUND_DESKTOP_BACKGROUND_OBSERVER_H_
 #define CHROME_BROWSER_CHROMEOS_BACKGROUND_DESKTOP_BACKGROUND_OBSERVER_H_
 #pragma once
 
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
+namespace ash {
+class UserWallpaperDelegate;
+}
+
 namespace chromeos {
 
+ash::UserWallpaperDelegate* CreateUserWallpaperDelegate();
+
 // Listens for background change events and passes them to the Aura shell's
 // DesktopBackgroundController class.
-class DesktopBackgroundObserver : public content::NotificationObserver{
+class DesktopBackgroundObserver : public content::NotificationObserver {
  public:
   DesktopBackgroundObserver();
   virtual ~DesktopBackgroundObserver();
 
  private:
-  // Returns the index of user selected wallpaper from a default wallpaper list.
-  int GetUserWallpaperIndex();
 
   // content::NotificationObserver implementation.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopBackgroundObserver);
 };
 
 }  // namespace chromeos
 #endif  // CHROME_BROWSER_CHROMEOS_BACKGROUND_DESKTOP_BACKGROUND_OBSERVER_H_