Standardize usage of virtual/override/final in cc/

cc/resources/gpu_raster_worker_pool.h

Index: cc/resources/gpu_raster_worker_pool.h
diff --git a/cc/resources/gpu_raster_worker_pool.h b/cc/resources/gpu_raster_worker_pool.h
index 48c17b1148696d030dfd5890cf12453e8e45ec8c..a4e4197c382b467d07ff1e9fcf6bb8e033a0300c 100644
--- a/cc/resources/gpu_raster_worker_pool.h
+++ b/cc/resources/gpu_raster_worker_pool.h
@@ -18,7 +18,7 @@ class CC_EXPORT GpuRasterWorkerPool : public RasterWorkerPool,
                                       public Rasterizer,
                                       public RasterizerTaskClient {
  public:
-  virtual ~GpuRasterWorkerPool();
+  ~GpuRasterWorkerPool() override;
 
   static scoped_ptr<RasterWorkerPool> Create(
       base::SequencedTaskRunner* task_runner,
@@ -26,18 +26,18 @@ class CC_EXPORT GpuRasterWorkerPool : public RasterWorkerPool,
       ResourceProvider* resource_provider);
 
   // 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:
   GpuRasterWorkerPool(base::SequencedTaskRunner* task_runner,