'length' property is invalid for some DOM bindings functions

LayoutTests/fast/js/function-length.html

Index: LayoutTests/fast/js/function-length.html
diff --git a/LayoutTests/fast/js/function-length.html b/LayoutTests/fast/js/function-length.html
index 52b4f9e1e83798a96768059f8ebd834ba44e7651..f33cc1959deb9df9a27f244dd26074d4ff12798b 100644
--- a/LayoutTests/fast/js/function-length.html
+++ b/LayoutTests/fast/js/function-length.html
@@ -13,6 +13,13 @@ shouldBe('window.showModalDialog.length', '1');
 shouldBe('window.setTimeout.length', '1');
 shouldBe('window.clearTimeout.length', '0');
 shouldBe('window.addEventListener.length', '2');
+shouldBe('window.postMessage.length', '2');
+shouldBe('window.dispatchEvent.length', '1');
+shouldBe('window.openDatabase.length', '4');
+shouldBe('window.history.pushState.length', '2');
+shouldBe('window.history.length', '1');
+shouldBe('window.URL.createObjectURL.length', '1');
+shouldBe('window.Storage.prototype.key.length', '1');
 
 shouldBe('Array.prototype.concat.length', '1');
 shouldBe('Array.prototype.join.length', '1');