DOMException toString is not correct

LayoutTests/fast/dom/DOMException/prototype-object.html

Index: LayoutTests/fast/dom/DOMException/prototype-object.html
diff --git a/LayoutTests/fast/dom/DOMException/prototype-object.html b/LayoutTests/fast/dom/DOMException/prototype-object.html
index eb3115aa313c8572d9a0689b4dfbbfd8c436b0b6..b81ae9ce18342bff2896ad25de5a46896cd6ce0f 100644
--- a/LayoutTests/fast/dom/DOMException/prototype-object.html
+++ b/LayoutTests/fast/dom/DOMException/prototype-object.html
@@ -12,7 +12,7 @@ try {
   e = err;
 }
 
-shouldBeEqualToString("e.toString()", "Error: HierarchyRequestError: DOM Exception 3");
+shouldBeEqualToString("e.toString()", "HierarchyRequestError: A Node was inserted somewhere it doesn't belong.");
 shouldBeEqualToString("Object.prototype.toString.call(e)", "[object DOMException]");
 shouldBeEqualToString("Object.prototype.toString.call(e.__proto__)", "[object DOMExceptionPrototype]");
 shouldBeEqualToString("Object.prototype.toString.call(e.__proto__.__proto__)", "[object Error]");
@@ -24,7 +24,7 @@ shouldBe("e.HIERARCHY_REQUEST_ERR", "e.constructor.HIERARCHY_REQUEST_ERR");
 shouldBe("e.HIERARCHY_REQUEST_ERR", "3");
 shouldBe("e.code", "3");
 shouldBeEqualToString("e.name", "HierarchyRequestError");
-shouldBeEqualToString("e.message", "HierarchyRequestError: DOM Exception 3");
+shouldBeEqualToString("e.message", "A Node was inserted somewhere it doesn't belong.");
 
 </script>
 <script src="../../js/resources/js-test-post.js"></script>