Remove use of index in wallpaper picker code and some refactor

chrome/browser/chromeos/login/user_manager.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_LOGIN_USER_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_USER_MANAGER_H_
 
 #include <string>
 
-#include "ash/desktop_background/desktop_background_resources.h"
 #include "base/memory/singleton.h"
 #include "chrome/browser/chromeos/login/user.h"
 
 class PrefService;
 
 namespace chromeos {
 
 class RemoveUserDelegate;
 class UserImageManager;
 
@@ skipping 156 matching lines @@
 
   virtual void AddObserver(Observer* obs) = 0;
   virtual void RemoveObserver(Observer* obs) = 0;
 
   virtual void NotifyLocalStateChanged() = 0;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_USER_MANAGER_H_