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

pkg/unittest/test/unittest_excess_callback_test.dart

Index: pkg/unittest/test/unittest_excess_callback_test.dart
===================================================================
--- pkg/unittest/test/unittest_excess_callback_test.dart	(revision 33351)
+++ pkg/unittest/test/unittest_excess_callback_test.dart	(working copy)
@@ -13,9 +13,9 @@
 
 var testFunction = (TestConfiguration testConfig) {
   test(testName, () {
-    var _callback0 = expectAsync(() => ++testConfig.count);
-    var _callback1 = expectAsync(() => ++testConfig.count);
-    var _callback2 = expectAsync(() {
+    var _callback0 = expectAsync0(() => ++testConfig.count);
+    var _callback1 = expectAsync0(() => ++testConfig.count);
+    var _callback2 = expectAsync0(() {
       _callback1();
       _callback1();
       _callback0();