mash: Migrate wallpaper controllers to ash/common.

components/wallpaper/wallpaper_resizer.h

Index: components/wallpaper/wallpaper_resizer.h
diff --git a/components/wallpaper/wallpaper_resizer.h b/components/wallpaper/wallpaper_resizer.h
index 658f7bb5beae94b994a2d4afbdd6f014604e9465..4e26bde03a5fd167aeecec78fb58dc2a1cc5b729 100644
--- a/components/wallpaper/wallpaper_resizer.h
+++ b/components/wallpaper/wallpaper_resizer.h
@@ -19,7 +19,7 @@
 #include "ui/gfx/image/image_skia.h"
 
 namespace base {
-class SequencedWorkerPool;
+class TaskRunner;
 }
 
 namespace wallpaper {
@@ -37,16 +37,15 @@ class WALLPAPER_EXPORT WallpaperResizer {
   WallpaperResizer(const gfx::ImageSkia& image,
                    const gfx::Size& target_size,
                    WallpaperLayout layout,
-                   base::SequencedWorkerPool* worker_pool_ptr);
+                   base::TaskRunner* task_runner);
 
   ~WallpaperResizer();
 
   const gfx::ImageSkia& image() const { return image_; }
   uint32_t original_image_id() const { return original_image_id_; }
   WallpaperLayout layout() const { return layout_; }
-  base::SequencedWorkerPool* worker_pool() const { return worker_pool_; }
 
-  // Called on the UI thread to run Resize() on the worker pool and post an
+  // Called on the UI thread to run Resize() on the task runner and post an
   // OnResizeFinished() task back to the UI thread on completion.
   void StartResize();
 
@@ -73,7 +72,7 @@ class WALLPAPER_EXPORT WallpaperResizer {
 
   WallpaperLayout layout_;
 
-  base::SequencedWorkerPool* worker_pool_;
+  base::TaskRunner* task_runner_;
 
   base::WeakPtrFactory<WallpaperResizer> weak_ptr_factory_;