Rename ash desktop_background to wallpaper.

ash/default_wallpaper_delegate.cc

 // Copyright 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.
 
 #include "ash/default_wallpaper_delegate.h"
 
-#include "ash/desktop_background/desktop_background_controller.h"
 #include "ash/shell.h"
+#include "ash/wallpaper/wallpaper_controller.h"
 #include "ui/wm/core/window_animations.h"
 
 namespace ash {
 
 int DefaultWallpaperDelegate::GetAnimationType() {
   return ::wm::WINDOW_VISIBILITY_ANIMATION_TYPE_FADE;
 }
 
 int DefaultWallpaperDelegate::GetAnimationDurationOverride() {
   return 0;
 }
 
 void DefaultWallpaperDelegate::SetAnimationDurationOverride(
     int animation_duration_in_ms) {}
 
 bool DefaultWallpaperDelegate::ShouldShowInitialAnimation() {
   return false;
 }
 
 void DefaultWallpaperDelegate::UpdateWallpaper(bool clear_cache) {}
 
 void DefaultWallpaperDelegate::InitializeWallpaper() {
-  ash::Shell::GetInstance()
-      ->desktop_background_controller()
-      ->CreateEmptyWallpaper();
+  ash::Shell::GetInstance()->wallpaper_controller()->CreateEmptyWallpaper();
 }
 
 void DefaultWallpaperDelegate::OpenSetWallpaperPage() {}
 
 bool DefaultWallpaperDelegate::CanOpenSetWallpaperPage() {
   return false;
 }
 
 void DefaultWallpaperDelegate::OnWallpaperAnimationFinished() {}
 
 void DefaultWallpaperDelegate::OnWallpaperBootAnimationFinished() {}
 
 }  // namespace ash