Workaround for 11854 (broken type check)

sdk/lib/js/dart2js/js_dart2js.dart

Index: sdk/lib/js/dart2js/js_dart2js.dart
diff --git a/sdk/lib/js/dart2js/js_dart2js.dart b/sdk/lib/js/dart2js/js_dart2js.dart
index 282e5fab99098b7cb81972ec4e952dc82d8d1362..7f806b73f3744794eeca4b725e61093b6cf12008 100644
--- a/sdk/lib/js/dart2js/js_dart2js.dart
+++ b/sdk/lib/js/dart2js/js_dart2js.dart
@@ -46,7 +46,9 @@ class JsObject implements Serializable<JsObject> {
 
   JsObject._fromJs(this._jsObject);
 
-  factory JsObject(Serializable<JsFunction> constructor, [List arguments]) {
+  // TODO(vsm): Type constructor as Serializable<JsFunction> when
+  // dartbug.com/11854 is fixed.
+  factory JsObject(var constructor, [List arguments]) {
     final constr = _convertToJS(constructor);
     if (arguments == null) {
       return new JsObject._fromJs(JS('=Object', 'new #()', constr));
@@ -135,7 +137,9 @@ return ret;
     JS('void', 'delete #[#]', _convertToJS(this), name);
   }
 
-  bool instanceof(Serializable<JsFunction> type) =>
+  // TODO(vsm): Type type as Serializable<JsFunction> when
+  // dartbug.com/11854 is fixed.
+  bool instanceof(var type) =>
       JS('bool', '# instanceof #', _convertToJS(this), _convertToJS(type));
 
   String toString() {