Have ElementData::attributeItem() return a reference

Source/core/page/PageSerializer.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 62 matching lines @@
     if (!node.isHTMLElement())
         return false;
 
     const HTMLElement& element = toHTMLElement(node);
     if (!element.hasTagName(HTMLNames::metaTag))
         return false;
     HTMLAttributeList attributes;
     if (element.hasAttributes()) {
         unsigned attributeCount = element.attributeCount();
         for (unsigned i = 0; i < attributeCount; ++i) {
-            const Attribute* attribute = element.attributeItem(i);
+            const Attribute& attribute = element.attributeItem(i);
             // FIXME: We should deal appropriately with the attribute if they have a namespace.
-            attributes.append(std::make_pair(attribute->name().localName(), attribute->value().string()));
+            attributes.append(std::make_pair(attribute.name().localName(), attribute.value().string()));
         }
     }
     WTF::TextEncoding textEncoding = encodingFromMetaAttributes(attributes);
     return textEncoding.isValid();
 }
 
 static bool shouldIgnoreElement(const Element& element)
 {
     return element.hasTagName(HTMLNames::scriptTag) || element.hasTagName(HTMLNames::noscriptTag) || isCharsetSpecifyingNode(element);
 }
@@ skipping 284 matching lines @@
     if (iter != m_blankFrameURLs.end())
         return iter->value;
     String url = "wyciwyg://frame/" + String::number(m_blankFrameCounter++);
     KURL fakeURL(ParsedURLString, url);
     m_blankFrameURLs.add(frame, fakeURL);
 
     return fakeURL;
 }
 
 }