Have ElementData::attributeItem() return a reference

Source/core/html/HTMLEmbedElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Stefan Schimanski (1Stein@gmx.de)
  * Copyright (C) 2004, 2005, 2006, 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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 99 matching lines @@
     }
 }
 
 void HTMLEmbedElement::parametersForPlugin(Vector<String>& paramNames, Vector<String>& paramValues)
 {
     if (!hasAttributes())
         return;
 
     unsigned attributeCount = this->attributeCount();
     for (unsigned i = 0; i < attributeCount; ++i) {
-        const Attribute* attribute = attributeItem(i);
-        paramNames.append(attribute->localName().string());
-        paramValues.append(attribute->value().string());
+        const Attribute& attribute = attributeItem(i);
+        paramNames.append(attribute.localName().string());
+        paramValues.append(attribute.value().string());
     }
 }
 
 // FIXME: This should be unified with HTMLObjectElement::updateWidget and
 // moved down into HTMLPluginElement.cpp
 void HTMLEmbedElement::updateWidgetInternal()
 {
     ASSERT(!renderEmbeddedObject()->showsUnavailablePluginIndicator());
     ASSERT(needsWidgetUpdate());
     setNeedsWidgetUpdate(false);
@@ skipping 70 matching lines @@
 {
     // http://www.whatwg.org/specs/web-apps/current-work/#exposed
     for (Node* ancestor = parentNode(); ancestor; ancestor = ancestor->parentNode()) {
         if (ancestor->hasTagName(objectTag) && toHTMLObjectElement(ancestor)->isExposed())
             return false;
     }
     return true;
 }
 
 }