Standardize usage of virtual/override/final in cc/

cc/layers/ui_resource_layer.h

Index: cc/layers/ui_resource_layer.h
diff --git a/cc/layers/ui_resource_layer.h b/cc/layers/ui_resource_layer.h
index f79389ba5ea17cbb46da5d9d54a7c5c0b61ce393..e22318c208777bbbb97e7695a282384c86831125 100644
--- a/cc/layers/ui_resource_layer.h
+++ b/cc/layers/ui_resource_layer.h
@@ -20,9 +20,9 @@ class CC_EXPORT UIResourceLayer : public Layer {
  public:
   static scoped_refptr<UIResourceLayer> Create();
 
-  virtual void PushPropertiesTo(LayerImpl* layer) override;
+  void PushPropertiesTo(LayerImpl* layer) override;
 
-  virtual void SetLayerTreeHost(LayerTreeHost* host) override;
+  void SetLayerTreeHost(LayerTreeHost* host) override;
 
   void SetBitmap(const SkBitmap& skbitmap);
 
@@ -47,9 +47,9 @@ class CC_EXPORT UIResourceLayer : public Layer {
 
  protected:
   UIResourceLayer();
-  virtual ~UIResourceLayer();
+  ~UIResourceLayer() override;
 
-  virtual bool HasDrawableContent() const override;
+  bool HasDrawableContent() const override;
 
   scoped_ptr<UIResourceHolder> ui_resource_holder_;
   SkBitmap bitmap_;
@@ -59,8 +59,7 @@ class CC_EXPORT UIResourceLayer : public Layer {
   float vertex_opacity_[4];
 
  private:
-  virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
-      override;
+  scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;
   void RecreateUIResourceHolder();