Allow the implementation to return references instead of pointers to the bindings

Source/core/dom/Element.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2013 Apple Inc. 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
@@ skipping 415 matching lines @@
     void beginParsingChildren() { setIsFinishedParsingChildren(false); }
 
     PseudoElement* pseudoElement(PseudoId) const;
     RenderObject* pseudoElementRenderer(PseudoId) const;
 
     virtual bool matchesReadOnlyPseudoClass() const { return false; }
     virtual bool matchesReadWritePseudoClass() const { return false; }
     bool matches(const String& selectors, ExceptionState&);
     virtual bool shouldAppearIndeterminate() const { return false; }
 
-    DOMTokenList* classList();
+    DOMTokenList& classList();
 
-    DOMStringMap* dataset();
+    DOMStringMap& dataset();
 
     virtual bool isMediaElement() const { return false; }
 
 #if ENABLE(INPUT_SPEECH)
     virtual bool isInputFieldSpeechButtonElement() const { return false; }
 #endif
 #if ENABLE(INPUT_MULTIPLE_FIELDS_UI)
     virtual bool isDateTimeEditElement() const { return false; }
     virtual bool isDateTimeFieldElement() const { return false; }
     virtual bool isPickerIndicatorElement() const { return false; }
@@ skipping 410 matching lines @@
 }
 
 inline bool isShadowHost(const Element* element)
 {
     return element && element->shadow();
 }
 
 } // namespace
 
 #endif