Replace more ObserverList with base::ObserverList.

components/wallpaper/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 COMPONENTS_WALLPAPER_WALLPAPER_RESIZER_H_
 #define COMPONENTS_WALLPAPER_WALLPAPER_RESIZER_H_
 
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "components/wallpaper/wallpaper_layout.h"
@@ skipping 38 matching lines @@
 
   // Add/Remove observers.
   void AddObserver(WallpaperResizerObserver* observer);
   void RemoveObserver(WallpaperResizerObserver* observer);
 
  private:
   // Copies |resized_bitmap| to |image_| and notifies observers after Resize()
   // has finished running.
   void OnResizeFinished(SkBitmap* resized_bitmap);
 
-  ObserverList<WallpaperResizerObserver> observers_;
+  base::ObserverList<WallpaperResizerObserver> observers_;
 
   // Image that should currently be used for wallpaper. It initially
   // contains the original image and is updated to contain the resized
   // image by OnResizeFinished().
   gfx::ImageSkia image_;
 
   // Unique identifier corresponding to the original (i.e. pre-resize) |image_|.
   uint32_t original_image_id_;
 
   gfx::Size target_size_;
 
   WallpaperLayout layout_;
 
   base::SequencedWorkerPool* worker_pool_;
 
   base::WeakPtrFactory<WallpaperResizer> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WallpaperResizer);
 };
 
 }  // namespace wallpaper
 
 #endif  // COMPONENTS_WALLPAPER_WALLPAPER_RESIZER_H_