Reenable types that were disabled because of a bug in dart2js.

sdk/lib/async/zone.dart

 // Copyright (c) 2013, 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;
 
 typedef dynamic ZoneCallback();
 typedef dynamic ZoneUnaryCallback(arg);
 typedef dynamic ZoneBinaryCallback(arg1, arg2);
 
@@ skipping 185 matching lines @@
     this.registerUnaryCallback: null,
     this.registerBinaryCallback: null,
     this.errorCallback: null,
     this.scheduleMicrotask: null,
     this.createTimer: null,
     this.createPeriodicTimer: null,
     this.print: null,
     this.fork: null
   });
 
-  // TODO(13406): Enable types when dart2js supports it.
-  final /*HandleUncaughtErrorHandler*/ handleUncaughtError;
-  final /*RunHandler*/ run;
-  final /*RunUnaryHandler*/ runUnary;
-  final /*RunBinaryHandler*/ runBinary;
-  final /*RegisterCallbackHandler*/ registerCallback;
-  final /*RegisterUnaryCallbackHandler*/ registerUnaryCallback;
-  final /*RegisterBinaryCallbackHandler*/ registerBinaryCallback;
-  final /*ErrorCallbackHandler*/ errorCallback;
-  final /*ScheduleMicrotaskHandler*/ scheduleMicrotask;
-  final /*CreateTimerHandler*/ createTimer;
-  final /*CreatePeriodicTimerHandler*/ createPeriodicTimer;
-  final /*PrintHandler*/ print;
-  final /*ForkHandler*/ fork;
+  final HandleUncaughtErrorHandler handleUncaughtError;
+  final RunHandler run;
+  final RunUnaryHandler runUnary;
+  final RunBinaryHandler runBinary;
+  final RegisterCallbackHandler registerCallback;
+  final RegisterUnaryCallbackHandler registerUnaryCallback;
+  final RegisterBinaryCallbackHandler registerBinaryCallback;
+  final ErrorCallbackHandler errorCallback;
+  final ScheduleMicrotaskHandler scheduleMicrotask;
+  final CreateTimerHandler createTimer;
+  final CreatePeriodicTimerHandler createPeriodicTimer;
+  final PrintHandler print;
+  final ForkHandler fork;
 }
 
 /**
  * This class wraps zones for delegation.
  *
  * When forwarding to parent zones one can't just invoke the parent zone's
  * exposed functions (like [Zone.run]), but one needs to provide more
  * information (like the zone the `run` was initiated). Zone callbacks thus
  * receive more information including this [ZoneDelegate] class. When delegating
  * to the parent zone one should go through the given instance instead of
@@ skipping 1025 matching lines @@
                                    handleUncaughtError: errorHandler);
   }
   Zone zone = Zone.current.fork(specification: zoneSpecification,
                                 zoneValues: zoneValues);
   if (onError != null) {
     return zone.runGuarded(body);
   } else {
     return zone.run(body);
   }
 }