Update DOM classes to use OVERRIDE / FINAL when needed

Source/core/dom/DatasetDOMStringMap.h

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 16 matching lines @@
 #define DatasetDOMStringMap_h
 
 #include "core/dom/DOMStringMap.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace WebCore {
 
 class Element;
 class ExceptionState;
 
-class DatasetDOMStringMap : public DOMStringMap {
+class DatasetDOMStringMap FINAL : public DOMStringMap {
 public:
     static PassOwnPtr<DatasetDOMStringMap> create(Element* element)
     {
         return adoptPtr(new DatasetDOMStringMap(element));
     }
 
-    virtual void ref();
-    virtual void deref();
+    virtual void ref() OVERRIDE;
+    virtual void deref() OVERRIDE;
 
-    virtual void getNames(Vector<String>&);
-    virtual String item(const String& name);
-    virtual bool contains(const String& name);
-    virtual void setItem(const String& name, const String& value, ExceptionState&);
-    virtual bool deleteItem(const String& name);
+    virtual void getNames(Vector<String>&) OVERRIDE;
+    virtual String item(const String& name) OVERRIDE;
+    virtual bool contains(const String& name) OVERRIDE;
+    virtual void setItem(const String& name, const String& value, ExceptionState&) OVERRIDE;
+    virtual bool deleteItem(const String& name) OVERRIDE;
 
-    virtual Element* element() { return m_element; }
+    virtual Element* element() OVERRIDE { return m_element; }
 
 private:
     explicit DatasetDOMStringMap(Element* element)
         : m_element(element)
     {
     }
 
     Element* m_element;
 };
 
 } // namespace WebCore
 
 #endif // DatasetDOMStringMap_h