Expose Zones.

tests/lib/async/run_zoned8_test.dart

Index: tests/lib/async/run_zoned8_test.dart
diff --git a/tests/lib/async/run_zoned8_test.dart b/tests/lib/async/run_zoned8_test.dart
index 6c0c89f3a116d26364d2bf332822c0f37015214c..cf642d5487c49b368ca0c17325260638becd7ced 100644
--- a/tests/lib/async/run_zoned8_test.dart
+++ b/tests/lib/async/run_zoned8_test.dart
@@ -9,26 +9,30 @@ import 'catch_errors.dart';
 
 main() {
   asyncStart();
+  Completer done = new Completer();
+
   var events = [];
   // Test runZoned with periodic Timers.
-  runZonedExperimental(() {
+  runZoned(() {
     int counter = 0;
     new Timer.periodic(const Duration(milliseconds: 50), (timer) {
-      if (counter == 1) timer.cancel();
+      if (counter == 1) {
+        timer.cancel();
+        done.complete(true);
+      }
       counter++;
       events.add(counter);
       throw counter;
     });
-  }, onError: (e) {
-       events.add("error: $e");
-     },
-     onDone: () {
-         Expect.listEquals([
-                           "main exit",
-                           1, "error: 1", 2, "error: 2",
-                           ],
-                           events);
-         asyncEnd();
-       });
+  }, onError: (e) { events.add("error: $e"); });
+
+  done.future.whenComplete(() {
+    Expect.listEquals([
+                      "main exit",
+                      1, "error: 1", 2, "error: 2",
+                      ],
+                      events);
+    asyncEnd();
+  });
   events.add("main exit");
 }