Add [TypeChecking=Interface] to XPath interfaces

Source/core/xml/XPathExpression.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 45 matching lines @@
         return nullptr;
 
     return expr.release();
 }
 
 DEFINE_TRACE(XPathExpression)
 {
     visitor->trace(m_topExpression);
 }
 
-PassRefPtrWillBeRawPtr<XPathResult> XPathExpression::evaluate(Node* contextNode, unsigned short type, XPathResult*, ExceptionState& exceptionState)
+PassRefPtrWillBeRawPtr<XPathResult> XPathExpression::evaluate(Node* contextNode, unsigned short type, const ScriptValue&, ExceptionState& exceptionState)
 {
-    if (!contextNode) {
-        exceptionState.throwDOMException(NotSupportedError, "The context node provided is null.");
-        return nullptr;
-    }
-
     if (!isValidContextNode(contextNode)) {
         exceptionState.throwDOMException(NotSupportedError, "The node provided is '" + contextNode->nodeName() + "', which is not a valid context node type.");
         return nullptr;
     }
 
     EvaluationContext evaluationContext(*contextNode);
     RefPtrWillBeRawPtr<XPathResult> result = XPathResult::create(evaluationContext, m_topExpression->evaluate(evaluationContext));
 
     if (evaluationContext.hadTypeConversionError) {
         // It is not specified what to do if type conversion fails while evaluating an expression.
         exceptionState.throwDOMException(SyntaxError, "Type conversion failed while evaluating the expression.");
         return nullptr;
     }
 
     if (type != XPathResult::ANY_TYPE) {
         result->convertTo(type, exceptionState);
         if (exceptionState.hadException())
             return nullptr;
     }
 
     return result;
 }
 
 }