Change "typedef" to "class" in core library and related tests.

sdk/lib/async/stream_controller.dart

 // Copyright (c) 2012, 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.
 
 part of dart.async;
 
 // -------------------------------------------------------------------
 // Controller for creating and adding events to a stream.
 // -------------------------------------------------------------------
 
@@ skipping 542 matching lines @@
                         void this._onCancel());
 }
 
 abstract class _NoCallbacks {
   _NotificationHandler get _onListen => null;
   _NotificationHandler get _onPause => null;
   _NotificationHandler get _onResume => null;
   _NotificationHandler get _onCancel => null;
 }
 
-typedef _NoCallbackAsyncStreamController/*<T>*/ = _StreamController/*<T>*/
+class _NoCallbackAsyncStreamController/*<T>*/ = _StreamController/*<T>*/
        with _AsyncStreamControllerDispatch/*<T>*/, _NoCallbacks;
 
-typedef _NoCallbackSyncStreamController/*<T>*/ = _StreamController/*<T>*/
+class _NoCallbackSyncStreamController/*<T>*/ = _StreamController/*<T>*/
        with _SyncStreamControllerDispatch/*<T>*/, _NoCallbacks;
 
 typedef void _NotificationHandler();
 
 void _runGuarded(_NotificationHandler notificationHandler) {
   if (notificationHandler == null) return;
   try {
     notificationHandler();
   } catch (e, s) {
     Zone.current.handleUncaughtError(_asyncError(e, s), s);
@@ skipping 97 matching lines @@
   var varData;
 
   _StreamControllerAddStreamState(_StreamController controller,
                                   this.varData,
                                   Stream source) : super(controller, source) {
     if (controller.isPaused) {
       addSubscription.pause();
     }
   }
 }