Remove unused includes from various .cpp files in core/

Source/core/xml/XPathValue.cpp

 /*
  * Copyright 2005 Frerich Raabe <raabe@kde.org>
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * 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 10 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/xml/XPathValue.h"
 
 #include <limits>
-#include "core/dom/Node.h"
 #include "core/xml/XPathExpressionNode.h"
 #include "core/xml/XPathUtil.h"
 #include <wtf/MathExtras.h>
 #include <wtf/StdLibExtras.h>
 
 using std::numeric_limits;
 
 namespace WebCore {
 namespace XPath {
 
@@ skipping 90 matching lines @@
             return String::number(m_number);
         case BooleanValue:
             return m_bool ? "true" : "false";
     }
     ASSERT_NOT_REACHED();
     return String();
 }
 
 }
 }