Standardize usage of virtual/override/final in cc/

cc/resources/pixel_buffer_raster_worker_pool.h

Index: cc/resources/pixel_buffer_raster_worker_pool.h
diff --git a/cc/resources/pixel_buffer_raster_worker_pool.h b/cc/resources/pixel_buffer_raster_worker_pool.h
index 78933aa96ca4dab298e729b6292fa724b306a0e5..7fb45ecd641ef698a36d6a0265628c128d85948f 100644
--- a/cc/resources/pixel_buffer_raster_worker_pool.h
+++ b/cc/resources/pixel_buffer_raster_worker_pool.h
@@ -29,7 +29,7 @@ class CC_EXPORT PixelBufferRasterWorkerPool : public RasterWorkerPool,
                                               public Rasterizer,
                                               public RasterizerTaskClient {
  public:
-  virtual ~PixelBufferRasterWorkerPool();
+  ~PixelBufferRasterWorkerPool() override;
 
   static scoped_ptr<RasterWorkerPool> Create(
       base::SequencedTaskRunner* task_runner,
@@ -39,18 +39,18 @@ class CC_EXPORT PixelBufferRasterWorkerPool : public RasterWorkerPool,
       size_t max_transfer_buffer_usage_bytes);
 
   // Overridden from RasterWorkerPool:
-  virtual Rasterizer* AsRasterizer() override;
+  Rasterizer* AsRasterizer() override;
 
   // Overridden from Rasterizer:
-  virtual void SetClient(RasterizerClient* client) override;
-  virtual void Shutdown() override;
-  virtual void ScheduleTasks(RasterTaskQueue* queue) override;
-  virtual void CheckForCompletedTasks() override;
+  void SetClient(RasterizerClient* client) override;
+  void Shutdown() override;
+  void ScheduleTasks(RasterTaskQueue* queue) override;
+  void CheckForCompletedTasks() override;
 
   // Overridden from RasterizerTaskClient:
-  virtual scoped_ptr<RasterBuffer> AcquireBufferForRaster(
+  scoped_ptr<RasterBuffer> AcquireBufferForRaster(
       const Resource* resource) override;
-  virtual void ReleaseBufferForRaster(scoped_ptr<RasterBuffer> buffer) override;
+  void ReleaseBufferForRaster(scoped_ptr<RasterBuffer> buffer) override;
 
  private:
   struct RasterTaskState {