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

Source/core/html/HTMLMapElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 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 17 matching lines @@
 
 namespace blink {
 
 class HitTestResult;
 class HTMLImageElement;
 
 class CORE_EXPORT HTMLMapElement final : public HTMLElement {
     DEFINE_WRAPPERTYPEINFO();
 public:
     DECLARE_NODE_FACTORY(HTMLMapElement);
-    virtual ~HTMLMapElement();
+    ~HTMLMapElement() override;
 
     const AtomicString& getName() const { return m_name; }
 
     HTMLAreaElement* areaForPoint(LayoutPoint, const LayoutSize& containerSize);
 
     HTMLImageElement* imageElement();
     PassRefPtrWillBeRawPtr<HTMLCollection> areas();
 
 private:
     explicit HTMLMapElement(Document&);
 
-    virtual void parseAttribute(const QualifiedName&, const AtomicString&) override;
+    void parseAttribute(const QualifiedName&, const AtomicString&) override;
 
-    virtual InsertionNotificationRequest insertedInto(ContainerNode*) override;
-    virtual void removedFrom(ContainerNode*) override;
+    InsertionNotificationRequest insertedInto(ContainerNode*) override;
+    void removedFrom(ContainerNode*) override;
 
     AtomicString m_name;
 };
 
 } // namespace blink
 
 #endif // HTMLMapElement_h