Node.appendChild should throw TypeError when newChild is not an object

LayoutTests/fast/dom/incompatible-operations.html

Index: LayoutTests/fast/dom/incompatible-operations.html
diff --git a/LayoutTests/fast/dom/incompatible-operations.html b/LayoutTests/fast/dom/incompatible-operations.html
index d79f94d4b1f6c57d10b339c2158d248f91e26a7a..7fca59c213a6ab4de79f8fea09b1db460645eab0 100644
--- a/LayoutTests/fast/dom/incompatible-operations.html
+++ b/LayoutTests/fast/dom/incompatible-operations.html
@@ -28,11 +28,11 @@ var aNode = document.createElement("div");
 var aSecondNode = document.createElement("div");
 aNode.appendChild(aSecondNode);
 
-shouldThrow("aNode.appendChild(aDOMImplementation)", '"NotFoundError: Failed to execute \'appendChild\' on \'Node\': The new child element is null."');
+shouldThrow("aNode.appendChild(aDOMImplementation)", '"TypeError: Failed to execute \'appendChild\' on \'Node\': parameter 1 is not of type \'Node\'."');
 
-shouldThrow("aNode.appendChild('knort')", '"NotFoundError: Failed to execute \'appendChild\' on \'Node\': The new child element is null."');
+shouldThrow("aNode.appendChild('knort')", '"TypeError: Failed to execute \'appendChild\' on \'Node\': parameter 1 is not of type \'Node\'."');
 
-shouldThrow("aNode.appendChild(void 0)", '"NotFoundError: Failed to execute \'appendChild\' on \'Node\': The new child element is null."');
+shouldThrow("aNode.appendChild(void 0)", '"TypeError: Failed to execute \'appendChild\' on \'Node\': parameter 1 is not of type \'Node\'."');
 
 shouldBeFalse("aNode.isSameNode(aDOMImplementation)");
 shouldBeFalse("aNode.isSameNode('foo')");