mash: Partially migrate ash/desktop_background to ash common types.

chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager_unittest.cc

 // Copyright 2014 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/users/wallpaper/wallpaper_manager.h"
 
 #include <cstdlib>
 #include <cstring>
 #include <memory>
 
-#include "ash/desktop_background/desktop_background_controller.h"
-#include "ash/desktop_background/desktop_background_controller_observer.h"
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/test/display_manager_test_api.h"
-#include "ash/test/test_user_wallpaper_delegate.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "chrome/browser/chromeos/login/startup_utils.h"
 #include "chrome/browser/chromeos/login/users/fake_chrome_user_manager.h"
 #include "chrome/browser/chromeos/login/users/scoped_user_manager_enabler.h"
 #include "chrome/browser/chromeos/settings/cros_settings.h"
 #include "chrome/browser/chromeos/settings/device_settings_service.h"
 #include "chrome/browser/prefs/browser_prefs.h"
@@ skipping 125 matching lines @@
   fake_user_manager()->RemoveUserFromList(test_account_id_2);
 
   // Test that only user1's wallpaper can be found in cache.
   EXPECT_TRUE(
       test_api->GetWallpaperFromCache(test_account_id_1, &cached_wallpaper));
   EXPECT_FALSE(
       test_api->GetWallpaperFromCache(test_account_id_2, &cached_wallpaper));
 }
 
 }  // namespace chromeos