Fix timer tests: timer tests were not using expectAsync to wait for

tests/isolate/spawn_function_test.dart

Index: tests/isolate/spawn_function_test.dart
diff --git a/tests/isolate/spawn_function_test.dart b/tests/isolate/spawn_function_test.dart
index 704bdb55dff91c082eccc912b75ccec75300ab2f..ae47227a21304269658d5a62880369ff9e3d61f8 100644
--- a/tests/isolate/spawn_function_test.dart
+++ b/tests/isolate/spawn_function_test.dart
@@ -14,10 +14,10 @@ child() {
 main() {
   test('message - reply chain', () {
     ReceivePort port = new ReceivePort();
-    port.receive(expectAsync(msg, _) {
+    port.receive(expectAsync2((msg, _) {
       port.close();
       expect(msg, equals('re: hi'));
-    });
+    }));
 
     SendPort s = spawnFunction(child);
     s.send('hi', port.toSendPort());