Remove GetBlockingPool() in wallpaper_manager.cc file.

The blocking pool has been deprecated in favor of TaskScheduler.

Bug: 667892
Change-Id: Iabaa23abc14ade5b5c0e4ed9bee6b8f574d7b689
Reviewed-on: https://chromium-review.googlesource.com/571306Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Commit-Queue: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486943}

chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager.cc

@@ -678,9 +678,9 @@ void WallpaperManager::SetCustomWallpaper(
     // Block shutdown on this task. Otherwise, we may lose the custom wallpaper
     // that the user selected.
     scoped_refptr<base::SequencedTaskRunner> blocking_task_runner =
-        BrowserThread::GetBlockingPool()
-            ->GetSequencedTaskRunnerWithShutdownBehavior(
-                sequence_token_, base::SequencedWorkerPool::BLOCK_SHUTDOWN);
+        base::CreateSequencedTaskRunnerWithTraits(
+            {base::MayBlock(), base::TaskPriority::USER_BLOCKING,
+             base::TaskShutdownBehavior::BLOCK_SHUTDOWN});
     // TODO(bshe): This may break if RawImage becomes RefCountedMemory.
     blocking_task_runner->PostTask(
         FROM_HERE, base::BindOnce(&WallpaperManager::SaveCustomWallpaper,
@@ -982,12 +982,9 @@ WallpaperManager::WallpaperManager()
                  content::NotificationService::AllSources());
   registrar_.Add(this, chrome::NOTIFICATION_WALLPAPER_ANIMATION_FINISHED,
                  content::NotificationService::AllSources());
-  sequence_token_ = BrowserThread::GetBlockingPool()->GetNamedSequenceToken(
-      wallpaper::kWallpaperSequenceTokenName);
-  task_runner_ =
-      BrowserThread::GetBlockingPool()
-          ->GetSequencedTaskRunnerWithShutdownBehavior(
-              sequence_token_, base::SequencedWorkerPool::CONTINUE_ON_SHUTDOWN);
+  task_runner_ = base::CreateSequencedTaskRunnerWithTraits(
+      {base::MayBlock(), base::TaskPriority::USER_BLOCKING,
+       base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN});
 
   user_manager::UserManager::Get()->AddSessionStateObserver(this);
 

components/wallpaper/wallpaper_manager_base.h

@@ -594,9 +594,6 @@ class WALLPAPER_EXPORT WallpaperManagerBase {
 
   base::ThreadChecker thread_checker_;
 
-  // Sequence token associated with wallpaper operations.
-  base::SequencedWorkerPool::SequenceToken sequence_token_;
-
   // Wallpaper sequenced task runner.
   scoped_refptr<base::SequencedTaskRunner> task_runner_;
 
@@ -644,4 +641,4 @@ class WALLPAPER_EXPORT WallpaperManagerBase {
 
 }  // namespace wallpaper
 
-#endif  // COMPONENTS_WALLPAPER_WALLPAPER_MANAGER_BASE_H_
+#endif  // COMPONENTS_WALLPAPER_WALLPAPER_MANAGER_BASE_H_
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