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..6c2cdebc2884af08243a42973166d9831d4e2bb0 100644
--- a/LayoutTests/fast/dom/incompatible-operations.html
+++ b/LayoutTests/fast/dom/incompatible-operations.html
@@ -30,9 +30,9 @@ aNode.appendChild(aSecondNode);
 
 shouldThrow("aNode.appendChild(aDOMImplementation)", '"NotFoundError: Failed to execute \'appendChild\' on \'Node\': The new child element is null."');
 
-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 (\'newChild\') is not an object."');
 
-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 (\'newChild\') is not an object."');
 
 shouldBeFalse("aNode.isSameNode(aDOMImplementation)");
 shouldBeFalse("aNode.isSameNode('foo')");