Standardize usage of virtual/override/final in cc/

cc/blink/web_content_layer_impl.h

Index: cc/blink/web_content_layer_impl.h
diff --git a/cc/blink/web_content_layer_impl.h b/cc/blink/web_content_layer_impl.h
index 9dab02d3aa5363bfd5259a5689ed6c6a0a0879ad..b9bb8713854c5409117f771477a8a93df28780ee 100644
--- a/cc/blink/web_content_layer_impl.h
+++ b/cc/blink/web_content_layer_impl.h
@@ -36,12 +36,12 @@ class WebContentLayerImpl : public blink::WebContentLayer,
   virtual ~WebContentLayerImpl();
 
   // ContentLayerClient implementation.
-  virtual void PaintContents(SkCanvas* canvas,
-                             const gfx::Rect& clip,
-                             ContentLayerClient::GraphicsContextStatus
-                                 graphics_context_status) override;
-  virtual void DidChangeLayerCanUseLCDText() override;
-  virtual bool FillsBoundsCompletely() const override;
+  void PaintContents(SkCanvas* canvas,
+                     const gfx::Rect& clip,
+                     ContentLayerClient::GraphicsContextStatus
+                         graphics_context_status) override;
+  void DidChangeLayerCanUseLCDText() override;
+  bool FillsBoundsCompletely() const override;
 
   scoped_ptr<WebLayerImpl> layer_;
   blink::WebContentLayerClient* client_;