Drop const_iterator for AttributeCollection

Source/core/xml/XPathStep.cpp

Index: Source/core/xml/XPathStep.cpp
diff --git a/Source/core/xml/XPathStep.cpp b/Source/core/xml/XPathStep.cpp
index 8acae87a9c22269c43e193f34f46d84b3467ec4b..7ef3d677d663d0522417b7f77f6404cc9ab5925e 100644
--- a/Source/core/xml/XPathStep.cpp
+++ b/Source/core/xml/XPathStep.cpp
@@ -384,8 +384,8 @@ void Step::nodesInAxis(EvaluationContext& evaluationContext, Node* context, Node
         }
 
         AttributeCollection attributes = contextElement->attributes();
-        AttributeCollection::const_iterator end = attributes.end();
-        for (AttributeCollection::const_iterator it = attributes.begin(); it != end; ++it) {
+        AttributeCollection::iterator end = attributes.end();
+        for (AttributeCollection::iterator it = attributes.begin(); it != end; ++it) {
             RefPtrWillBeRawPtr<Attr> attr = contextElement->ensureAttr(it->name());
             if (nodeMatches(evaluationContext, attr.get(), AttributeAxis, nodeTest()))
                 nodes.append(attr.release());