Apply default wallpaper from customization manifest.

ash/desktop_background/wallpaper_resizer.h

 // Copyright (c) 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.
 
 #ifndef ASH_DESKTOP_BACKGROUND_DESKTOP_WALLPAPER_RESIZER_H_
 #define ASH_DESKTOP_BACKGROUND_DESKTOP_WALLPAPER_RESIZER_H_
 
 #include "ash/ash_export.h"
 #include "ash/desktop_background/desktop_background_controller.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "skia/ext/image_operations.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/gfx/size.h"
 
 namespace ash {
 
 class WallpaperResizerObserver;
 
-extern const int kInvalidResourceID;
-
 // Stores the current wallpaper data and resize it to |target_size| if needed.
 class ASH_EXPORT WallpaperResizer {
  public:
   // Returns a unique identifier corresponding to |image|, suitable for
   // comparison against the value returned by original_image_id(). If the image
   // is modified, its ID will change.
   static uint32_t GetImageId(const gfx::ImageSkia& image);
 
   WallpaperResizer(int image_resource_id,
                    const gfx::Size& target_size,
@@ skipping 43 matching lines @@
 
   base::WeakPtrFactory<WallpaperResizer> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WallpaperResizer);
 };
 
 }  // namespace ash
 
 
 #endif  // ASH_DESKTOP_BACKGROUND_DESKTOP_WALLPAPER_RESIZER_H_