Standardize usage of virtual/override/final specifiers.

ash/wm/gestures/long_press_affordance_handler.h

Index: ash/wm/gestures/long_press_affordance_handler.h
diff --git a/ash/wm/gestures/long_press_affordance_handler.h b/ash/wm/gestures/long_press_affordance_handler.h
index 01a9c09c758ada954138642b9e39fc711b04861e..9c7a1a469a825dc67799d5cf65184e9e54a4906e 100644
--- a/ash/wm/gestures/long_press_affordance_handler.h
+++ b/ash/wm/gestures/long_press_affordance_handler.h
@@ -31,7 +31,7 @@ class LongPressAffordanceHandler : public gfx::LinearAnimation,
                                    public aura::WindowObserver {
  public:
   LongPressAffordanceHandler();
-  virtual ~LongPressAffordanceHandler();
+  ~LongPressAffordanceHandler() override;
 
   // Displays or removes long press affordance according to the |event|.
   void ProcessEvent(aura::Window* target, ui::GestureEvent* event);
@@ -52,11 +52,11 @@ class LongPressAffordanceHandler : public gfx::LinearAnimation,
   void SetTapDownTarget(aura::Window* target);
 
   // Overridden from gfx::LinearAnimation.
-  virtual void AnimateToState(double state) override;
-  virtual void AnimationStopped() override;
+  void AnimateToState(double state) override;
+  void AnimationStopped() override;
 
   // Overridden from aura::WindowObserver.
-  virtual void OnWindowDestroying(aura::Window* window) override;
+  void OnWindowDestroying(aura::Window* window) override;
 
   scoped_ptr<LongPressAffordanceView> view_;
   gfx::Point tap_down_location_;