Make iterator for Element's attributes more lightweight

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 6bba25293ac06e7b23ead6825eda1431497bb50b..a86e938e650c9ee6edd53989101900dfe7ec0bcd 100644
--- a/Source/core/xml/parser/XMLDocumentParser.cpp
+++ b/Source/core/xml/parser/XMLDocumentParser.cpp
@@ -807,9 +807,9 @@ XMLDocumentParser::XMLDocumentParser(DocumentFragment* fragment, Element* parent
     for (; !elemStack.isEmpty(); elemStack.removeLast()) {
         Element* element = elemStack.last();
         if (element->hasAttributes()) {
-            AttributeIteratorAccessor attributes = element->attributesIterator();
-            AttributeConstIterator end = attributes.end();
-            for (AttributeConstIterator it = attributes.begin(); it != end; ++it) {
+            AttributeCollection attributes = element->attributes();
+            AttributeCollection::const_iterator end = attributes.end();
+            for (AttributeCollection::const_iterator it = attributes.begin(); it != end; ++it) {
                 if (it->localName() == xmlnsAtom)
                     m_defaultNamespaceURI = it->value();
                 else if (it->prefix() == xmlnsAtom)