DOMException toString is not correct

LayoutTests/fast/dom/Range/surroundContents-1.html

 <p>This tests for HIERARCHY_REQUEST_ERRs when calling Range::surroundContents.</p>
 <div id="select" style="border: 1px solid blue;">Hello world.</div>
 <div id="insert" style="border: 1px solid red;"></div>
 <ul id="console"></ul>
 <script>
 function log(str) {
     var li = document.createElement("li");
     li.appendChild(document.createTextNode(str));
     var console = document.getElementById("console");
     console.appendChild(li);
 }
 
 var range = document.createRange();
 var select = document.getElementById("select");
 var text = select.firstChild;
 
 var insert = document.getElementById("insert");
 
 range.setStart(text, 0);
 range.setEnd(text, text.length);
 
 try {
-    range.surroundContents(select);    
+    range.surroundContents(select);
 } catch (e) {
-    var error = "Error: HierarchyRequestError: DOM Exception 3";
+    var error = "HierarchyRequestError: A Node was inserted somewhere it doesn't belong.";
     if (e != error)
         log ("Failure, expected: " + error);
 }
 
 try {
-    range.surroundContents(insert); 
+    range.surroundContents(insert);
 } catch (e) {
     log ("Failure: " + error);
 }
 </script>