Have ElementTraversal::firstWithin() take a reference

Source/core/svg/SVGElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2008 Rob Buis <buis@kde.org>
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Alp Toker <alp@atoker.com>
  * Copyright (C) 2009 Cameron McCormack <cam@mcc.id.au>
  *
  * 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 245 matching lines @@
 
             // If the <use> title is not empty we found the title to use.
             String useTitle(useElement->title());
             if (!useTitle.isEmpty())
                 return useTitle;
         }
     }
 
     // If we aren't an instance in a <use> or the <use> title was not found, then find the first
     // <title> child of this element.
-    Element* titleElement = ElementTraversal::firstWithin(this);
+    Element* titleElement = ElementTraversal::firstWithin(*this);
     for (; titleElement; titleElement = ElementTraversal::nextSkippingChildren(titleElement, this)) {
         if (titleElement->hasTagName(SVGNames::titleTag) && titleElement->isSVGElement())
             break;
     }
 
     // If a title child was found, return the text contents.
     if (titleElement)
         return titleElement->innerText();
 
     // Otherwise return a null/empty string.
@@ skipping 907 matching lines @@
     }
 
     if (name == classAttr)
         return true;
 
     return animatableAttributes.contains(name);
 }
 #endif
 
 }