Standardize usage of virtual/override/final in cc/

cc/resources/zero_copy_raster_worker_pool.h

Index: cc/resources/zero_copy_raster_worker_pool.h
diff --git a/cc/resources/zero_copy_raster_worker_pool.h b/cc/resources/zero_copy_raster_worker_pool.h
index b94713d7b6ff6113ebc1dcdd5f492d4717d5e74a..d1f583ee16488b0d425e5e8bd48ec6dffba11748 100644
--- a/cc/resources/zero_copy_raster_worker_pool.h
+++ b/cc/resources/zero_copy_raster_worker_pool.h
@@ -23,7 +23,7 @@ class CC_EXPORT ZeroCopyRasterWorkerPool : public RasterWorkerPool,
                                            public Rasterizer,
                                            public RasterizerTaskClient {
  public:
-  virtual ~ZeroCopyRasterWorkerPool();
+  ~ZeroCopyRasterWorkerPool() override;
 
   static scoped_ptr<RasterWorkerPool> Create(
       base::SequencedTaskRunner* task_runner,
@@ -31,18 +31,18 @@ class CC_EXPORT ZeroCopyRasterWorkerPool : 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;
 
  protected:
   ZeroCopyRasterWorkerPool(base::SequencedTaskRunner* task_runner,