Drop const_iterator for AttributeCollection

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 48ffd716061d48b477547a81c4ae603f66ba0605..ba3ccf584a192e6c7ff998d02bdac02e53841151 100644
--- a/Source/core/xml/parser/XMLDocumentParser.cpp
+++ b/Source/core/xml/parser/XMLDocumentParser.cpp
@@ -813,8 +813,8 @@ XMLDocumentParser::XMLDocumentParser(DocumentFragment* fragment, Element* parent
     for (; !elemStack.isEmpty(); elemStack.removeLast()) {
         Element* element = elemStack.last();
         AttributeCollection attributes = element->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) {
             if (it->localName() == xmlnsAtom)
                 m_defaultNamespaceURI = it->value();
             else if (it->prefix() == xmlnsAtom)