Standardize usage of virtual/override/final in ui/

ui/events/event.h

Index: ui/events/event.h
diff --git a/ui/events/event.h b/ui/events/event.h
index e970826ce38b3f6f683932f5b19a23baa5e16b4b..d774897bcf29e287165f45f317035d00a11aec9f 100644
--- a/ui/events/event.h
+++ b/ui/events/event.h
@@ -256,12 +256,12 @@ class EVENTS_EXPORT Event {
 class EVENTS_EXPORT CancelModeEvent : public Event {
  public:
   CancelModeEvent();
-  virtual ~CancelModeEvent();
+  ~CancelModeEvent() override;
 };
 
 class EVENTS_EXPORT LocatedEvent : public Event {
  public:
-  virtual ~LocatedEvent();
+  ~LocatedEvent() override;
 
   float x() const { return location_.x(); }
   float y() const { return location_.y(); }
@@ -469,7 +469,7 @@ class EVENTS_EXPORT MouseWheelEvent : public MouseEvent {
   const gfx::Vector2d& offset() const { return offset_; }
 
   // Overridden from LocatedEvent.
-  virtual void UpdateForRootTransform(
+  void UpdateForRootTransform(
       const gfx::Transform& inverted_root_transform) override;
 
  private:
@@ -508,7 +508,7 @@ class EVENTS_EXPORT TouchEvent : public LocatedEvent {
              float angle,
              float force);
 
-  virtual ~TouchEvent();
+  ~TouchEvent() override;
 
   int touch_id() const { return touch_id_; }
   float radius_x() const { return radius_x_; }
@@ -521,7 +521,7 @@ class EVENTS_EXPORT TouchEvent : public LocatedEvent {
   void set_radius_y(const float r) { radius_y_ = r; }
 
   // Overridden from LocatedEvent.
-  virtual void UpdateForRootTransform(
+  void UpdateForRootTransform(
       const gfx::Transform& inverted_root_transform) override;
 
  protected:
@@ -615,7 +615,7 @@ class EVENTS_EXPORT KeyEvent : public Event {
 
   KeyEvent& operator=(const KeyEvent& rhs);
 
-  virtual ~KeyEvent();
+  ~KeyEvent() override;
 
   // TODO(erg): While we transition to mojo, we have to hack around a mismatch
   // in our event types. Our ui::Events don't really have all the data we need
@@ -802,7 +802,7 @@ class EVENTS_EXPORT GestureEvent : public LocatedEvent {
         details_(model.details_) {
   }
 
-  virtual ~GestureEvent();
+  ~GestureEvent() override;
 
   const GestureEventDetails& details() const { return details_; }