IDL: Support 'stringifier' keyword

Source/core/dom/Range.idl

 /*
  * Copyright (C) 2006 Apple Computer, Inc.
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 38 matching lines @@
     const unsigned short END_TO_START   = 3;
 
     [RaisesException] short compareBoundaryPoints(CompareHow how, Range sourceRange);
 
     [RaisesException, CustomElementCallbacks] void deleteContents();
     [RaisesException, CustomElementCallbacks] DocumentFragment extractContents();
     [RaisesException, CustomElementCallbacks] DocumentFragment cloneContents();
     [RaisesException, CustomElementCallbacks] void insertNode(Node newNode);
     [RaisesException, CustomElementCallbacks] void surroundContents(Node newParent);
     Range cloneRange();
-    DOMString toString();
+
+    stringifier;
 
     [DeprecateAs=RangeDetach] void detach();
 
     [RaisesException] boolean isPointInRange(Node refNode, long offset);
     [RaisesException] short comparePoint(Node refNode, long offset);
 
     [RaisesException] boolean intersectsNode(Node refNode);
 
     // CSSOM View Module API extensions
 
     ClientRectList getClientRects();
     ClientRect getBoundingClientRect();
 
     // DOM Parsing and Serialization
 
     [RaisesException, CustomElementCallbacks] DocumentFragment createContextualFragment(DOMString html);
 
     // WebKit extensions
 
     // CompareResults
     const unsigned short NODE_BEFORE           = 0;
     const unsigned short NODE_AFTER            = 1;
     const unsigned short NODE_BEFORE_AND_AFTER = 2;
     const unsigned short NODE_INSIDE           = 3;
 
     [RaisesException, MeasureAs=RangeCompareNode] short compareNode([Default=Undefined] optional Node refNode);
 
     [RaisesException, MeasureAs=RangeExpand] void expand([Default=Undefined] optional DOMString unit);
 };