Fix test_sky after 14270f1151aacfa650985c4333572c356d15c024

sky/tests/events/custom-event.sky

 <script>
 import "../resources/third_party/unittest/unittest.dart";
 import "../resources/unit.dart";
 
 import "dart:sky";
 
 class MyEvent extends Event {
-  MyEvent() : super("awesome", bubbles: true);
+  MyEvent() : super(type: "awesome", bubbles: true);
 
   bool get isCustom => true;
 }
 
 void main() {
   initUnit();
 
   test("should be able to dispatch", () {
     var event = new MyEvent();
     expect(event.isCustom, isTrue);
     expect(event.type, equals("awesome"));
     expect(event.bubbles, isTrue);
     expect(event.cancelable, isFalse);
     expect(event.isCustom, isTrue);
 
     bool gotEvent = false;
     var element = document.createElement("div");
     element.addEventListener("awesome", (e) {
       expect(e, equals(event));
       expect(event.isCustom, isTrue);
       gotEvent = true;
     });
     element.dispatchEvent(event);
     expect(gotEvent, isTrue);
   });
 }
 </script>