Clean up ContainerNode exception messages.

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 0d9ab2d716b79368b9feb483614e7b1d53a9f298..a20fd9b1942494c238d3b80597a5fa10103c4250 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()", "HierarchyRequestError: Failed to execute 'appendChild' on 'ContainerNode': The new child element contains the parent.");
+shouldBeEqualToString("e.toString()", "HierarchyRequestError: Failed to execute 'appendChild' on 'Node': The new child element contains the parent.");
 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", "Failed to execute 'appendChild' on 'ContainerNode': The new child element contains the parent.");
+shouldBeEqualToString("e.message", "Failed to execute 'appendChild' on 'Node': The new child element contains the parent.");
 
 </script>
 <script src="../../js/resources/js-test-post.js"></script>