Standardize usage of virtual/override/final in cc/

cc/resources/content_layer_updater.h

Index: cc/resources/content_layer_updater.h
diff --git a/cc/resources/content_layer_updater.h b/cc/resources/content_layer_updater.h
index 33d3ee521f060a2161207a9a74ebdf43bffbcf80..e0c54e551ffe3cb6c14f696c8baf6bc888125041 100644
--- a/cc/resources/content_layer_updater.h
+++ b/cc/resources/content_layer_updater.h
@@ -22,15 +22,15 @@ class RenderingStatsInstrumentation;
 class CC_EXPORT ContentLayerUpdater : public LayerUpdater {
  public:
   void set_rendering_stats_instrumentation(RenderingStatsInstrumentation* rsi);
-  virtual void SetOpaque(bool opaque) override;
-  virtual void SetFillsBoundsCompletely(bool fills_bounds) override;
-  virtual void SetBackgroundColor(SkColor background_color) override;
+  void SetOpaque(bool opaque) override;
+  void SetFillsBoundsCompletely(bool fills_bounds) override;
+  void SetBackgroundColor(SkColor background_color) override;
 
  protected:
   ContentLayerUpdater(scoped_ptr<LayerPainter> painter,
                       RenderingStatsInstrumentation* stats_instrumentation,
                       int layer_id);
-  virtual ~ContentLayerUpdater();
+  ~ContentLayerUpdater() override;
 
   // Paints the contents. |content_size| size of the underlying layer in
   // layer's content space. |paint_rect| bounds to paint in content space of the