Fix and reenable dart2js extra tests and dart2js native tests.

tests/compiler/dart2js_extra/closure3_test.dart

Index: tests/compiler/dart2js_extra/closure3_test.dart
===================================================================
--- tests/compiler/dart2js_extra/closure3_test.dart	(revision 13907)
+++ tests/compiler/dart2js_extra/closure3_test.dart	(working copy)
@@ -3,11 +3,11 @@
 // BSD-style license that can be found in the LICENSE file.
 
 main() {
-  var f = fun([a = 3, b = 8]) {
+  var f = fun({a: 3, b: 8}) {
     return a + b;
   };
   Expect.equals(11, f());
-  Expect.equals(499, f(3, 496));
-  Expect.equals(42, f(20, b: 22));
+  Expect.equals(499, f(a: 3, b: 496));
+  Expect.equals(42, f(a: 20, b: 22));
   Expect.equals(99, f(b: 66, a: 33));
 }