Have Element::ensureUniqueElementData() return a reference

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 267 matching lines @@
     virtual void attributeChanged(const QualifiedName&, const AtomicString&, AttributeModificationReason = ModifiedDirectly);
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) { }
 
     // Only called by the parser immediately after element construction.
     void parserSetAttributes(const Vector<Attribute>&);
 
     // Remove attributes that might introduce scripting from the vector leaving the element unchanged.
     void stripScriptingAttributes(Vector<Attribute>&) const;
 
     const ElementData* elementData() const { return m_elementData.get(); }
-    UniqueElementData* ensureUniqueElementData();
+    UniqueElementData& ensureUniqueElementData();
 
     void synchronizeAllAttributes() const;
 
     // Clones attributes only.
     void cloneAttributesFromElement(const Element&);
 
     // Clones all attribute-derived data, including subclass specifics (through copyNonAttributeProperties.)
     void cloneDataFromElement(const Element&);
 
     bool hasEquivalentAttributes(const Element* other) const;
@@ skipping 483 matching lines @@
 inline bool Element::hasID() const
 {
     return elementData() && elementData()->hasID();
 }
 
 inline bool Element::hasClass() const
 {
     return elementData() && elementData()->hasClass();
 }
 
-inline UniqueElementData* Element::ensureUniqueElementData()
+inline UniqueElementData& Element::ensureUniqueElementData()
 {
     if (!elementData() || !elementData()->isUnique())
         createUniqueElementData();
-    return static_cast<UniqueElementData*>(m_elementData.get());
+    return static_cast<UniqueElementData&>(*m_elementData);
 }
 
 // Put here to make them inline.
 inline bool Node::hasID() const
 {
     return isElementNode() && toElement(this)->hasID();
 }
 
 inline bool Node::hasClass() const
 {
@@ skipping 52 matching lines @@
 }
 
 inline bool isShadowHost(const Element* element)
 {
     return element && element->shadow();
 }
 
 } // namespace
 
 #endif