Revert https://code.google.com/p/dart/source/detail?r=33346

pkg/unittest/test/unittest_middle_exception_test.dart

Index: pkg/unittest/test/unittest_middle_exception_test.dart
===================================================================
--- pkg/unittest/test/unittest_middle_exception_test.dart	(revision 33351)
+++ pkg/unittest/test/unittest_middle_exception_test.dart	(working copy)
@@ -15,7 +15,7 @@
   test('testOne', () { expect(true, isTrue); });
   test('testTwo', () { expect(true, isFalse); });
   test('testThree', () {
-    var done = expectAsync(() {});
+    var done = expectAsync0((){});
     _defer(() {
       expect(true, isTrue);
       done();