Replace single-threaded SequencedWorkerPool with base::Thread in WallpaperResizerTest.

components/wallpaper/wallpaper_resizer.cc

 // 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.
 
 #include "components/wallpaper/wallpaper_resizer.h"
 
+#include <utility>
+
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/task_runner.h"
 #include "components/wallpaper/wallpaper_resizer_observer.h"
 #include "third_party/skia/include/core/SkImage.h"
 #include "ui/gfx/image/image_skia_rep.h"
 #include "ui/gfx/skia_util.h"
 
 namespace wallpaper {
@@ skipping 81 matching lines @@
 // static
 uint32_t WallpaperResizer::GetImageId(const gfx::ImageSkia& image) {
   const gfx::ImageSkiaRep& image_rep = image.GetRepresentation(1.0f);
   return image_rep.is_null() ? 0 : image_rep.sk_bitmap().getGenerationID();
 }
 
 WallpaperResizer::WallpaperResizer(
     const gfx::ImageSkia& image,
     const gfx::Size& target_size,
     WallpaperLayout layout,
-    const scoped_refptr<base::TaskRunner>& task_runner)
+    scoped_refptr<base::TaskRunner> task_runner)
     : image_(image),
       original_image_id_(GetImageId(image_)),
       target_size_(target_size),
       layout_(layout),
-      task_runner_(task_runner),
+      task_runner_(std::move(task_runner)),
       weak_ptr_factory_(this) {
   image_.MakeThreadSafe();
 }
 
 WallpaperResizer::~WallpaperResizer() {
 }
 
 void WallpaperResizer::StartResize() {
   SkBitmap* resized_bitmap = new SkBitmap;
   if (!task_runner_->PostTaskAndReply(
@@ skipping 15 matching lines @@
 void WallpaperResizer::RemoveObserver(WallpaperResizerObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
 void WallpaperResizer::OnResizeFinished(SkBitmap* resized_bitmap) {
   image_ = gfx::ImageSkia::CreateFrom1xBitmap(*resized_bitmap);
   FOR_EACH_OBSERVER(WallpaperResizerObserver, observers_, OnWallpaperResized());
 }
 
 }  // namespace wallpaper