cc: Simplify Task and its derived classes.

cc/raster/gpu_tile_task_worker_pool.h

 // Copyright 2014 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 CC_RASTER_GPU_TILE_TASK_WORKER_POOL_H_
 #define CC_RASTER_GPU_TILE_TASK_WORKER_POOL_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
-#include "cc/raster/tile_task_runner.h"
 #include "cc/raster/tile_task_worker_pool.h"
 
 namespace cc {
 class ContextProvider;
 class GpuRasterizer;
 class ResourceProvider;
 
 class CC_EXPORT GpuTileTaskWorkerPool : public TileTaskWorkerPool,
                                         public RasterBufferProvider {
  public:
@@ skipping 34 matching lines @@
   TaskGraphRunner* task_graph_runner_;
   const NamespaceToken namespace_token_;
   std::unique_ptr<GpuRasterizer> rasterizer_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuTileTaskWorkerPool);
 };
 
 }  // namespace cc
 
 #endif  // CC_RASTER_GPU_TILE_TASK_WORKER_POOL_H_