Standardize usage of virtual/override/final in ui/

ui/compositor/float_animation_curve_adapter.h

Index: ui/compositor/float_animation_curve_adapter.h
diff --git a/ui/compositor/float_animation_curve_adapter.h b/ui/compositor/float_animation_curve_adapter.h
index 84a999250cb211db6fda604c24edd1d3462a9fec..1c7b8b336c3f0ec26269e9a0e019291f087505f8 100644
--- a/ui/compositor/float_animation_curve_adapter.h
+++ b/ui/compositor/float_animation_curve_adapter.h
@@ -18,12 +18,12 @@ class FloatAnimationCurveAdapter : public cc::FloatAnimationCurve {
                              float target_value,
                              base::TimeDelta duration);
 
-  virtual ~FloatAnimationCurveAdapter() { }
+  ~FloatAnimationCurveAdapter() override {}
 
   // FloatAnimationCurve implementation.
-  virtual double Duration() const override;
-  virtual scoped_ptr<cc::AnimationCurve> Clone() const override;
-  virtual float GetValue(double t) const override;
+  double Duration() const override;
+  scoped_ptr<cc::AnimationCurve> Clone() const override;
+  float GetValue(double t) const override;
 
  private:
   gfx::Tween::Type tween_type_;