cc: Remove ScheduleOnOriginThread() and CompleteOnOriginThread().

cc/raster/bitmap_tile_task_worker_pool.h

Index: cc/raster/bitmap_tile_task_worker_pool.h
diff --git a/cc/raster/bitmap_tile_task_worker_pool.h b/cc/raster/bitmap_tile_task_worker_pool.h
index 4f6d99df3858e51ddc924ffdd19228396b37a2cc..d5ac8019ba82854980ad296f1bb045dfdea0171a 100644
--- a/cc/raster/bitmap_tile_task_worker_pool.h
+++ b/cc/raster/bitmap_tile_task_worker_pool.h
@@ -38,9 +38,10 @@ class CC_EXPORT BitmapTileTaskWorkerPool : public TileTaskWorkerPool,
   // Overridden from TileTaskRunner:
   void Shutdown() override;
   void ScheduleTasks(TaskGraph* graph) override;
-  void CheckForCompletedTasks() override;
+  void CollectCompletedTasks(Task::Vector* completed_tasks) override;
   ResourceFormat GetResourceFormat(bool must_support_alpha) const override;
   bool GetResourceRequiresSwizzle(bool must_support_alpha) const override;
+  TileTaskClient* AsTileTaskClient() override;
 
   // Overridden from TileTaskClient:
   std::unique_ptr<RasterBuffer> AcquireBufferForRaster(
@@ -63,8 +64,6 @@ class CC_EXPORT BitmapTileTaskWorkerPool : public TileTaskWorkerPool,
   const NamespaceToken namespace_token_;
   ResourceProvider* resource_provider_;
 
-  Task::Vector completed_tasks_;
-
   DISALLOW_COPY_AND_ASSIGN(BitmapTileTaskWorkerPool);
 };