Fix virtual/override/final usage in Source/core/html/.

Source/core/html/HTMLFieldSetElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 25 matching lines @@
 public:
     static PassRefPtrWillBeRawPtr<HTMLFieldSetElement> create(Document&, HTMLFormElement*);
     DECLARE_VIRTUAL_TRACE();
     HTMLLegendElement* legend() const;
 
     PassRefPtrWillBeRawPtr<HTMLFormControlsCollection> elements();
 
     const FormAssociatedElement::List& associatedElements() const;
 
 protected:
-    virtual void disabledAttributeChanged() override;
+    void disabledAttributeChanged() override;
 
 private:
     HTMLFieldSetElement(Document&, HTMLFormElement*);
 
-    virtual bool isEnumeratable() const override { return true; }
-    virtual bool supportsFocus() const override;
-    virtual LayoutObject* createLayoutObject(const ComputedStyle&) override;
-    virtual const AtomicString& formControlType() const override;
-    virtual bool recalcWillValidate() const override { return false; }
-    virtual bool matchesValidityPseudoClasses() const override final;
-    virtual bool isValidElement() override final;
-    virtual void childrenChanged(const ChildrenChange&) override;
-    virtual bool areAuthorShadowsAllowed() const override { return false; }
-    virtual bool isSubmittableElement() override;
-    virtual bool alwaysCreateUserAgentShadowRoot() const override { return false; }
+    bool isEnumeratable() const override { return true; }
+    bool supportsFocus() const override;
+    LayoutObject* createLayoutObject(const ComputedStyle&) override;
+    const AtomicString& formControlType() const override;
+    bool recalcWillValidate() const override { return false; }
+    bool matchesValidityPseudoClasses() const final;
+    bool isValidElement() final;
+    void childrenChanged(const ChildrenChange&) override;
+    bool areAuthorShadowsAllowed() const override { return false; }
+    bool isSubmittableElement() override;
+    bool alwaysCreateUserAgentShadowRoot() const override { return false; }
 
     static void invalidateDisabledStateUnder(Element&);
     void refreshElementsIfNeeded() const;
 
     mutable FormAssociatedElement::List m_associatedElements;
     // When dom tree is modified, we have to refresh the m_associatedElements array.
     mutable uint64_t m_documentVersion;
 };
 
 } // namespace blink
 
 #endif // HTMLFieldSetElement_h