Adding validation that Custom element constructor has zero args

tests/html/custom/created_callback_test.dart

Index: tests/html/custom/created_callback_test.dart
diff --git a/tests/html/custom/created_callback_test.dart b/tests/html/custom/created_callback_test.dart
index 1ca50fdf24a2e9ff700c6ad869eb71110dcd536e..a7fc2ee5fabe39aff4a61e025c6cd351a4735f81 100644
--- a/tests/html/custom/created_callback_test.dart
+++ b/tests/html/custom/created_callback_test.dart
@@ -147,6 +147,12 @@ main() {
     expect(e is ErrorConstructorElement, isFalse);
   });
 
+  test('cannot register created with params', () {
+    expect(() {
+      document.register('x-created-with-params', CreatedWithParametersElement);
+    }, throws);
+  });
+
   test('created cannot be called from nested constructor',
       NestedCreatedConstructorElement.test);
 
@@ -273,6 +279,10 @@ class NestedCreatedConstructorElement extends HtmlElement {
   }
 }
 
+class CreatedWithParametersElement extends HtmlElement {
+  CreatedWithParametersElement.created(ignoredParam) : super.created();
+}
+
 void expectGlobalError(Function test) {
   js.context['testExpectsGlobalError'] = true;
   try {