Reduce repetitive EventTarget subclassing

Source/core/dom/Node.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * 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
@@ skipping 617 matching lines @@
 
     enum ShadowTreesTreatment {
         TreatShadowTreesAsDisconnected,
         TreatShadowTreesAsComposed
     };
 
     unsigned short compareDocumentPositionInternal(const Node*, ShadowTreesTreatment) const;
 
     virtual Node* toNode();
 
-    virtual const AtomicString& interfaceName() const;
-    virtual ScriptExecutionContext* scriptExecutionContext() const;
+    virtual const AtomicString& interfaceName() const OVERRIDE;
+    virtual ScriptExecutionContext* scriptExecutionContext() const OVERRIDE;
 
     virtual bool addEventListener(const AtomicString& eventType, PassRefPtr<EventListener>, bool useCapture);
     virtual bool removeEventListener(const AtomicString& eventType, EventListener*, bool useCapture);
 
     // Handlers to do/undo actions on the target node before an event is dispatched to it and after the event
     // has been dispatched.  The data pointer is handed back by the preDispatch and passed to postDispatch.
     virtual void* preDispatchEventHandler(Event*) { return 0; }
     virtual void postDispatchEventHandler(Event*, void* /*dataFromPreDispatch*/) { }
 
     using EventTarget::dispatchEvent;
@@ skipping 19 matching lines @@
     virtual void dispatchChangeEvent();
     virtual void dispatchInputEvent();
 
     // Perform the default action for an event.
     virtual void defaultEventHandler(Event*);
     virtual void willCallDefaultEventHandler(const Event&);
 
     using TreeShared<Node>::ref;
     using TreeShared<Node>::deref;
 
-    virtual EventTargetData* eventTargetData();
-    virtual EventTargetData* ensureEventTargetData();
+    virtual EventTargetData* eventTargetData() OVERRIDE;
+    virtual EventTargetData& ensureEventTargetData() OVERRIDE;
 
     void getRegisteredMutationObserversOfType(HashMap<MutationObserver*, MutationRecordDeliveryOptions>&, MutationObserver::MutationType, const QualifiedName* attributeName);
     void registerMutationObserver(MutationObserver*, MutationObserverOptions, const HashSet<AtomicString>& attributeFilter);
     void unregisterMutationObserver(MutationObserverRegistration*);
     void registerTransientMutationObserver(MutationObserverRegistration*);
     void unregisterTransientMutationObserver(MutationObserverRegistration*);
     void notifyMutationObserversNodeWillDetach();
 
     virtual void registerScopedHTMLStyleChild();
     virtual void unregisterScopedHTMLStyleChild();
@@ skipping 135 matching lines @@
     bool isUserActionElementActive() const;
     bool isUserActionElementInActiveChain() const;
     bool isUserActionElementHovered() const;
     bool isUserActionElementFocused() const;
 
     void setStyleChange(StyleChangeType);
 
     // Used to share code between lazyAttach and setNeedsStyleRecalc.
     void markAncestorsWithChildNeedsStyleRecalc();
 
-    virtual void refEventTarget();
-    virtual void derefEventTarget();
+    virtual void refEventTarget() OVERRIDE;
+    virtual void derefEventTarget() OVERRIDE;
 
     virtual RenderStyle* nonRendererStyle() const { return 0; }
 
     virtual RenderStyle* virtualComputedStyle(PseudoId = NOPSEUDO);
 
     Element* ancestorElement() const;
 
     void trackForDebugging();
 
     Vector<OwnPtr<MutationObserverRegistration> >* mutationObserverRegistry();
@@ skipping 77 matching lines @@
 
 } //namespace
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const WebCore::Node*);
 void showNodePath(const WebCore::Node*);
 #endif
 
 #endif