Standardize usage of virtual/override/final in ui/

ui/gfx/animation/slide_animation.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_GFX_ANIMATION_SLIDE_ANIMATION_H_
 #define UI_GFX_ANIMATION_SLIDE_ANIMATION_H_
 
 #include "ui/gfx/animation/linear_animation.h"
 #include "ui/gfx/animation/tween.h"
 
@@ skipping 29 matching lines @@
 //     if (animation_->is_animating()) {
 //       hover_image_.SetOpacity(animation_->GetCurrentValue());
 //     }
 //   }
 //  private:
 //   scoped_ptr<SlideAnimation> animation_;
 // }
 class GFX_EXPORT SlideAnimation : public LinearAnimation {
  public:
   explicit SlideAnimation(AnimationDelegate* target);
-  virtual ~SlideAnimation();
+  ~SlideAnimation() override;
 
   // Set the animation back to the 0 state.
   virtual void Reset();
   virtual void Reset(double value);
 
   // Begin a showing animation or reverse a hiding animation in progress.
   virtual void Show();
 
   // Begin a hiding animation or reverse a showing animation in progress.
   virtual void Hide();
 
   // Sets the time a slide will take. Note that this isn't actually
   // the amount of time an animation will take as the current value of
   // the slide is considered.
   virtual void SetSlideDuration(int duration);
   int GetSlideDuration() const { return slide_duration_; }
   void SetTweenType(Tween::Type tween_type) { tween_type_ = tween_type; }
 
-  virtual double GetCurrentValue() const override;
+  double GetCurrentValue() const override;
   bool IsShowing() const { return showing_; }
   bool IsClosing() const { return !showing_ && value_end_ < value_current_; }
 
   class TestApi;
 
  private:
   // Overridden from Animation.
-  virtual void AnimateToState(double state) override;
+  void AnimateToState(double state) override;
 
   AnimationDelegate* target_;
 
   Tween::Type tween_type_;
 
   // Used to determine which way the animation is going.
   bool showing_;
 
   // Animation values. These are a layer on top of Animation::state_ to
   // provide the reversability.
   double value_start_;
   double value_end_;
   double value_current_;
 
   // How long a hover in/out animation will last for. This defaults to
   // kHoverFadeDurationMS, but can be overridden with SetDuration.
   int slide_duration_;
 
   DISALLOW_COPY_AND_ASSIGN(SlideAnimation);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_ANIMATION_SLIDE_ANIMATION_H_