Standardize usage of virtual/override/final in cc/

cc/quads/io_surface_draw_quad.h

Index: cc/quads/io_surface_draw_quad.h
diff --git a/cc/quads/io_surface_draw_quad.h b/cc/quads/io_surface_draw_quad.h
index 382915622684958a9b96da6d1c70018af656d314..9c8b50b52820eebddabb88d54dcaf6d845144fee 100644
--- a/cc/quads/io_surface_draw_quad.h
+++ b/cc/quads/io_surface_draw_quad.h
@@ -43,13 +43,12 @@ class CC_EXPORT IOSurfaceDrawQuad : public DrawQuad {
   unsigned io_surface_resource_id;
   Orientation orientation;
 
-  virtual void IterateResources(const ResourceIteratorCallback& callback)
-      override;
+  void IterateResources(const ResourceIteratorCallback& callback) override;
 
   static const IOSurfaceDrawQuad* MaterialCast(const DrawQuad*);
 
  private:
-  virtual void ExtendValue(base::debug::TracedValue* value) const override;
+  void ExtendValue(base::debug::TracedValue* value) const override;
 };
 
 }  // namespace cc