Make iterator for Element's attributes more lightweight

Source/core/xml/XPathNodeSet.cpp

Index: Source/core/xml/XPathNodeSet.cpp
diff --git a/Source/core/xml/XPathNodeSet.cpp b/Source/core/xml/XPathNodeSet.cpp
index 44ee351ceb57b51d9226cb77a2c3a06273cf56ce..cfb758645b2939bd92753f85ff700aa390293ade 100644
--- a/Source/core/xml/XPathNodeSet.cpp
+++ b/Source/core/xml/XPathNodeSet.cpp
@@ -237,9 +237,9 @@ void NodeSet::traversalSort() const
         if (!element->hasAttributes())
             continue;
 
-        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) {
             RefPtrWillBeRawPtr<Attr> attr = element->attrIfExists(it->name());
             if (attr && nodes.contains(attr.get()))
                 sortedNodes.append(attr);