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

Source/core/events/UIEvent.h

Index: Source/core/events/UIEvent.h
diff --git a/Source/core/events/UIEvent.h b/Source/core/events/UIEvent.h
index e5f8907154e3949d85a4eeffb8c8dccca785acde..f5b156a5aec3a0c19d09d8d29294040e9a780366 100644
--- a/Source/core/events/UIEvent.h
+++ b/Source/core/events/UIEvent.h
@@ -51,7 +51,7 @@ public:
     {
         return adoptRefWillBeNoop(new UIEvent(type, initializer));
     }
-    virtual ~UIEvent();
+    ~UIEvent() override;
 
     void initUIEvent(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtrWillBeRawPtr<AbstractView>, int detail);
 
@@ -59,8 +59,8 @@ public:
     int detail() const { return m_detail; }
     InputDevice* sourceDevice() const { return m_sourceDevice.get(); }
 
-    virtual const AtomicString& interfaceName() const override;
-    virtual bool isUIEvent() const override final;
+    const AtomicString& interfaceName() const override;
+    bool isUIEvent() const final;
 
     virtual int keyCode() const;
     virtual int charCode() const;