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

Source/core/html/HTMLSummaryElement.h

 /*
  * Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 13 matching lines @@
 #include "core/html/HTMLElement.h"
 
 namespace blink {
 
 class HTMLDetailsElement;
 
 class HTMLSummaryElement final : public HTMLElement {
 public:
     static PassRefPtrWillBeRawPtr<HTMLSummaryElement> create(Document&);
     bool isMainSummary() const;
-    virtual bool willRespondToMouseClickEvents() override;
+    bool willRespondToMouseClickEvents() override;
 
     Element* markerControl();
 
 private:
     explicit HTMLSummaryElement(Document&);
 
-    virtual LayoutObject* createLayoutObject(const ComputedStyle&) override;
-    virtual void defaultEventHandler(Event*) override;
-    virtual void didAddUserAgentShadowRoot(ShadowRoot&) override;
+    LayoutObject* createLayoutObject(const ComputedStyle&) override;
+    void defaultEventHandler(Event*) override;
+    void didAddUserAgentShadowRoot(ShadowRoot&) override;
     HTMLDetailsElement* detailsElement() const;
 
-    virtual bool supportsFocus() const override;
+    bool supportsFocus() const override;
 };
 
 }
 
 #endif // HTMLSummaryElement_h