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

Source/core/xml/XPathResult.cpp

 /*
  * 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 155 matching lines @@
 
 bool XPathResult::invalidIteratorState() const
 {
     if (resultType() != UNORDERED_NODE_ITERATOR_TYPE && resultType() != ORDERED_NODE_ITERATOR_TYPE)
         return false;
 
     ASSERT(m_document);
     return m_document->domTreeVersion() != m_domTreeVersion;
 }
 
-unsigned long XPathResult::snapshotLength(ExceptionState& exceptionState) const
+unsigned XPathResult::snapshotLength(ExceptionState& exceptionState) const
 {
     if (resultType() != UNORDERED_NODE_SNAPSHOT_TYPE && resultType() != ORDERED_NODE_SNAPSHOT_TYPE) {
         exceptionState.throwTypeError("The result type is not a snapshot.");
         return 0;
     }
 
     return m_value.toNodeSet(0).size();
 }
 
 Node* XPathResult::iterateNext(ExceptionState& exceptionState)
@@ skipping 11 matching lines @@
     if (m_nodeSetPosition + 1 > nodeSet().size())
         return 0;
 
     Node* node = nodeSet()[m_nodeSetPosition];
 
     m_nodeSetPosition++;
 
     return node;
 }
 
-Node* XPathResult::snapshotItem(unsigned long index, ExceptionState& exceptionState)
+Node* XPathResult::snapshotItem(unsigned index, ExceptionState& exceptionState)
 {
     if (resultType() != UNORDERED_NODE_SNAPSHOT_TYPE && resultType() != ORDERED_NODE_SNAPSHOT_TYPE) {
         exceptionState.throwTypeError("The result type is not a snapshot.");
         return 0;
     }
 
     const NodeSet& nodes = m_value.toNodeSet(0);
     if (index >= nodes.size())
         return 0;
 
     return nodes[index];
 }
 
 }