Load deferred chunks in the right order.

tests/compiler/dart2js_extra/deferred/deferred_function_test.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.
 
 // Test that loading of a library (with top-level functions only) can
 // be deferred.
 
 import 'package:async_helper/async_helper.dart';
 import 'package:expect/expect.dart';
 
@@ skipping 10 matching lines @@
   // function closures.  We think they are never null.
   if (new DateTime.now().millisecondsSinceEpoch == 87) return null;
   return lib.foo;
 }
 
 main() {
   Expect.throws(() { lib.foo('a'); }, isNoSuchMethodError);
   Expect.throws(readFoo, isNoSuchMethodError);
   int counter = 0;
   asyncStart();
-  lazy.load().then((bool didLoad) {
-    Expect.isTrue(didLoad);
+  lazy.load().then((_) {
     Expect.equals(1, ++counter);
     print('lazy was loaded');
     Expect.equals(42, lib.foo('b'));
     Expect.isNotNull(readFoo());
     asyncEnd();
   });
   Expect.equals(0, counter);
   asyncStart();
-  lazy.load().then((bool didLoad) {
-    Expect.isFalse(didLoad);
+  lazy.load().then((_) {
     Expect.equals(2, ++counter);
     print('lazy was loaded');
     Expect.equals(42, lib.foo('b'));
     Expect.isNotNull(readFoo());
     asyncEnd();
   });
   Expect.equals(0, counter);
   Expect.throws(() { lib.foo('a'); }, isNoSuchMethodError);
   Expect.throws(readFoo, isNoSuchMethodError);
 }