Reland " Preload default wallpaper."

chrome/browser/chromeos/login/user_manager_impl.cc

 // 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.
 
 #include "chrome/browser/chromeos/login/user_manager_impl.h"
 
 #include <vector>
 
 #include "ash/desktop_background/desktop_background_controller.h"
 #include "ash/shell.h"
@@ skipping 713 matching lines @@
   int user_image_size = GetCurrentUserImageSize();
 
   if (prefs_users) {
     for (ListValue::const_iterator it = prefs_users->begin();
          it != prefs_users->end(); ++it) {
       std::string email;
       if ((*it)->GetAsString(&email)) {
         User* user = CreateUser(email, /* is_ephemeral= */ false);
         users_.push_back(user);
 
-        WallpaperManager::Get()->CacheIfCustomWallpaper(email);
-
         if (prefs_images) {
           // Get account image path.
           // TODO(avayvod): Reading image path as a string is here for
           // backward compatibility.
           std::string image_path;
           const base::DictionaryValue* image_properties;
           if (prefs_images->GetStringWithoutPathExpansion(email, &image_path)) {
             int image_id = User::kInvalidImageIndex;
             if (IsDefaultImagePath(image_path, &image_id)) {
               user->SetImage(UserImage(GetDefaultImage(image_id)), image_id);
@@ skipping 626 matching lines @@
     BrowserThread::PostTask(
         BrowserThread::FILE,
         FROM_HERE,
         base::Bind(&UserManagerImpl::DeleteUserImage,
                    base::Unretained(this),
                    image_path));
   }
 }
 
 }  // namespace chromeos