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

Source/core/html/HTMLFormControlsCollection.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Samsung Electronics. 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 24 matching lines @@
 class RadioNodeListOrElement;
 
 // This class is just a big hack to find form elements even in malformed HTML elements.
 // The famous <table><tr><form><td> problem.
 
 class HTMLFormControlsCollection final : public HTMLCollection {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<HTMLFormControlsCollection> create(ContainerNode&, CollectionType);
 
-    virtual ~HTMLFormControlsCollection();
+    ~HTMLFormControlsCollection() override;
 
     HTMLElement* item(unsigned offset) const { return toHTMLElement(HTMLCollection::item(offset)); }
 
-    virtual HTMLElement* namedItem(const AtomicString& name) const override;
+    HTMLElement* namedItem(const AtomicString& name) const override;
     void namedGetter(const AtomicString& name, RadioNodeListOrElement&);
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     explicit HTMLFormControlsCollection(ContainerNode&);
 
-    virtual void updateIdNameCache() const override;
-    virtual void supportedPropertyNames(Vector<String>& names) override;
+    void updateIdNameCache() const override;
+    void supportedPropertyNames(Vector<String>& names) override;
 
     const FormAssociatedElement::List& formControlElements() const;
     const WillBeHeapVector<RawPtrWillBeMember<HTMLImageElement>>& formImageElements() const;
-    virtual HTMLElement* virtualItemAfter(Element*) const override;
-    virtual void invalidateCache(Document* oldDocument = 0) const override;
+    HTMLElement* virtualItemAfter(Element*) const override;
+    void invalidateCache(Document* oldDocument = 0) const override;
 
     mutable RawPtrWillBeMember<HTMLElement> m_cachedElement;
     mutable unsigned m_cachedElementOffsetInArray;
 };
 DEFINE_TYPE_CASTS(HTMLFormControlsCollection, LiveNodeListBase, collection, collection->type() == FormControls, collection.type() == FormControls);
 
 } // namespace blink
 
 #endif // HTMLFormControlsCollection_h