Have MutationObserverRegistration deal with references instead of pointers

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 634 matching lines @@
     void dispatchInputEvent();
 
     // Perform the default action for an event.
     virtual void defaultEventHandler(Event*);
     virtual void willCallDefaultEventHandler(const Event&);
 
     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 registerMutationObserver(MutationObserver&, MutationObserverOptions, const HashSet<AtomicString>& attributeFilter);
     void unregisterMutationObserver(MutationObserverRegistration*);
     void registerTransientMutationObserver(MutationObserverRegistration*);
     void unregisterTransientMutationObserver(MutationObserverRegistration*);
     void notifyMutationObserversNodeWillDetach();
 
     virtual void registerScopedHTMLStyleChild();
     virtual void unregisterScopedHTMLStyleChild();
     size_t numberOfScopedHTMLStyleChildren() const;
 
     unsigned connectedSubframeCount() const;
@@ skipping 241 matching lines @@
 
 } // namespace WebCore
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const WebCore::Node*);
 void showNodePath(const WebCore::Node*);
 #endif
 
 #endif