Fix stream_controller_test failure.

tests/lib/async/stream_controller_test.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Test the basic StreamController and StreamController.singleSubscription.
 library stream_controller_test;
 
 import "package:expect/expect.dart";
 import 'dart:async';
 import 'event_helper.dart';
@@ skipping 80 matching lines @@
   // Test transform.
   c = new StreamController.broadcast();
   sentEvents = new Events()..add("a")..error(42)..add("b")..close();
   expectedEvents =
       new Events()..error("a")..add(42)..error("b")..add("foo")..close();
   actualEvents = new Events.capture(c.stream.transform(
       new StreamTransformer(
           handleData: (v, s) { s.addError(new AsyncError(v)); },
           handleError: (e, s) { s.add(e.error); },
           handleDone: (s) {
+
             s.add("foo");
+
             s.close();
+
           })));
   sentEvents.replay(c);
   Expect.listEquals(expectedEvents.events, actualEvents.events);
 
   // Test multiple filters.
   c = new StreamController.broadcast();
   sentEvents = new Events()..add(42)
                            ..add("snugglefluffy")
                            ..add(7)
                            ..add("42")
@@ skipping 253 matching lines @@
   sentEvents.replay(c);
   Expect.listEquals(expectedEvents.events, actualEvents.events);
 
 
   c = new StreamController();
   expectedEvents = new Events()..add(1)..add(2)..close();
   actualEvents = new Events.capture(c.stream.takeWhile((x) => x <= 2));
   sentEvents.replay(c);
   Expect.listEquals(expectedEvents.events, actualEvents.events);
 
+
   c = new StreamController();
   sentEvents = new Events()
       ..add(1)..add(1)..add(2)..add(1)..add(2)..add(2)..add(2)..close();
   expectedEvents = new Events()
       ..add(1)..add(2)..add(1)..add(2)..close();
   actualEvents = new Events.capture(c.stream.distinct());
   sentEvents.replay(c);
   Expect.listEquals(expectedEvents.events, actualEvents.events);
 
+
   c = new StreamController();
   sentEvents = new Events()
       ..add(5)..add(6)..add(4)..add(6)..add(8)..add(3)..add(4)..add(1)..close();
   expectedEvents = new Events()
       ..add(5)..add(4)..add(3)..add(1)..close();
   // Use 'distinct' as a filter with access to the previously emitted event.
   actualEvents = new Events.capture(c.stream.distinct((a, b) => a < b));
   sentEvents.replay(c);
   Expect.listEquals(expectedEvents.events, actualEvents.events);
 }
@@ skipping 10 matching lines @@
     Expect.isTrue(c.isClosed);
   }
 }
 
 main() {
   testMultiController();
   testSingleController();
   testExtraMethods();
   testClosed();
 }