Use "unsigned" rather than "unsigned long" for C++ code interacting with WebIDL's "unsigned long".

Source/core/xml/XPathResult.h

 /*
  * Copyright (C) 2005 Frerich Raabe <raabe@kde.org>
  * Copyright (C) 2006, 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 57 matching lines @@
     void convertTo(unsigned short type, ExceptionState&);
 
     unsigned short resultType() const;
 
     double numberValue(ExceptionState&) const;
     String stringValue(ExceptionState&) const;
     bool booleanValue(ExceptionState&) const;
     Node* singleNodeValue(ExceptionState&) const;
 
     bool invalidIteratorState() const;
-    unsigned long snapshotLength(ExceptionState&) const;
+    unsigned snapshotLength(ExceptionState&) const;
     Node* iterateNext(ExceptionState&);
-    Node* snapshotItem(unsigned long index, ExceptionState&);
+    Node* snapshotItem(unsigned index, ExceptionState&);
 
     const XPath::Value& value() const { return m_value; }
 
     void trace(Visitor*);
 
 private:
     XPathResult(XPath::EvaluationContext&, const XPath::Value&);
     XPath::NodeSet& nodeSet() { return *m_nodeSet; }
 
     XPath::Value m_value;
     unsigned m_nodeSetPosition;
     OwnPtrWillBeMember<XPath::NodeSet> m_nodeSet; // FIXME: why duplicate the node set stored in m_value?
     unsigned short m_resultType;
     RefPtrWillBeMember<Document> m_document;
     uint64_t m_domTreeVersion;
 };
 
 } // namespace blink
 
 #endif // XPathResult_h