Have ElementData::attributeItem() return a reference

Source/core/xml/parser/XMLDocumentParser.cpp

Index: Source/core/xml/parser/XMLDocumentParser.cpp
diff --git a/Source/core/xml/parser/XMLDocumentParser.cpp b/Source/core/xml/parser/XMLDocumentParser.cpp
index b3ae0c69d9829e1f8ff1106619fc623ca630484d..c2a06b2a0c3401e4498807e6c9e81e54e5b145b7 100644
--- a/Source/core/xml/parser/XMLDocumentParser.cpp
+++ b/Source/core/xml/parser/XMLDocumentParser.cpp
@@ -839,11 +839,11 @@ XMLDocumentParser::XMLDocumentParser(DocumentFragment* fragment, Element* parent
         if (element->hasAttributes()) {
             unsigned attributeCount = element->attributeCount();
             for (unsigned i = 0; i < attributeCount; ++i) {
-                const Attribute* attribute = element->attributeItem(i);
-                if (attribute->localName() == xmlnsAtom)
-                    m_defaultNamespaceURI = attribute->value();
-                else if (attribute->prefix() == xmlnsAtom)
-                    m_prefixToNamespaceMap.set(attribute->localName(), attribute->value());
+                const Attribute& attribute = element->attributeItem(i);
+                if (attribute.localName() == xmlnsAtom)
+                    m_defaultNamespaceURI = attribute.value();
+                else if (attribute.prefix() == xmlnsAtom)
+                    m_prefixToNamespaceMap.set(attribute.localName(), attribute.value());
             }
         }
     }