Have Element::ensureUniqueElementData() return a reference

Source/core/svg/SVGElement.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  * Copyright (C) 2009 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
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 88 matching lines @@
     void animatedPropertyTypeForAttribute(const QualifiedName&, Vector<AnimatedPropertyType>&);
     PassRefPtr<NewSVGAnimatedPropertyBase> propertyFromAttribute(const QualifiedName& attributeName);
 
     void sendSVGLoadEventIfPossible(bool sendParentLoadEvents = false);
     void sendSVGLoadEventIfPossibleAsynchronously();
     void svgLoadEventTimerFired(Timer<SVGElement>*);
     virtual Timer<SVGElement>* svgLoadEventTimer();
 
     virtual AffineTransform* supplementalTransform() { return 0; }
 
-    void invalidateSVGAttributes() { ensureUniqueElementData()->m_animatedSVGAttributesAreDirty = true; }
+    void invalidateSVGAttributes() { ensureUniqueElementData().m_animatedSVGAttributesAreDirty = true; }
 
     const HashSet<SVGElementInstance*>& instancesForElement() const;
 
     bool getBoundingBox(FloatRect&);
 
     void setCursorElement(SVGCursorElement*);
     void cursorElementRemoved();
     void setCursorImageValue(CSSCursorImageValue*);
     void cursorImageValueRemoved();
 
@@ skipping 134 matching lines @@
         return DefaultHash<QualifiedName>::Hash::hash(key);
     }
     static bool equal(const QualifiedName& a, const QualifiedName& b) { return a.matches(b); }
 };
 
 DEFINE_NODE_TYPE_CASTS(SVGElement, isSVGElement());
 
 }
 
 #endif