Standardize usage of virtual/override/final in cc/

cc/quads/yuv_video_draw_quad.h

Index: cc/quads/yuv_video_draw_quad.h
diff --git a/cc/quads/yuv_video_draw_quad.h b/cc/quads/yuv_video_draw_quad.h
index e0fc7580df848c863e77f6f296e5e6081420c8d1..e1c54109f65f32abeaf58ce5df706d0001c073a6 100644
--- a/cc/quads/yuv_video_draw_quad.h
+++ b/cc/quads/yuv_video_draw_quad.h
@@ -21,7 +21,7 @@ class CC_EXPORT YUVVideoDrawQuad : public DrawQuad {
     COLOR_SPACE_LAST = REC_601_JPEG
   };
 
-  virtual ~YUVVideoDrawQuad();
+  ~YUVVideoDrawQuad() override;
 
   YUVVideoDrawQuad();
 
@@ -55,13 +55,12 @@ class CC_EXPORT YUVVideoDrawQuad : public DrawQuad {
   unsigned a_plane_resource_id;
   ColorSpace color_space;
 
-  virtual void IterateResources(const ResourceIteratorCallback& callback)
-      override;
+  void IterateResources(const ResourceIteratorCallback& callback) override;
 
   static const YUVVideoDrawQuad* MaterialCast(const DrawQuad*);
 
  private:
-  virtual void ExtendValue(base::debug::TracedValue* value) const override;
+  void ExtendValue(base::debug::TracedValue* value) const override;
 };
 
 }  // namespace cc