Fix virtual/override/final usage in the rest of Source/core/.

Source/core/events/GestureEvent.h

Index: Source/core/events/GestureEvent.h
diff --git a/Source/core/events/GestureEvent.h b/Source/core/events/GestureEvent.h
index 767623358c309110c65c79a6c6c2b853284a8ce0..c42eeee6632fa7e444933d23d0beb1ed7f0b3c75 100644
--- a/Source/core/events/GestureEvent.h
+++ b/Source/core/events/GestureEvent.h
@@ -35,13 +35,13 @@ namespace blink {
 
 class CORE_EXPORT GestureEvent final : public MouseRelatedEvent {
 public:
-    virtual ~GestureEvent() { }
+    ~GestureEvent() override { }
 
     static PassRefPtrWillBeRawPtr<GestureEvent> create(PassRefPtrWillBeRawPtr<AbstractView>, const PlatformGestureEvent&);
 
-    virtual bool isGestureEvent() const override;
+    bool isGestureEvent() const override;
 
-    virtual const AtomicString& interfaceName() const override;
+    const AtomicString& interfaceName() const override;
 
     float deltaX() const { return m_deltaX; }
     float deltaY() const { return m_deltaY; }
@@ -68,7 +68,7 @@ private:
 
     GestureEvent& event() const;
 
-    virtual bool dispatchEvent(EventDispatcher&) const override;
+    bool dispatchEvent(EventDispatcher&) const override;
 };
 
 DEFINE_EVENT_TYPE_CASTS(GestureEvent);