Update deferred_libraries_test in pub.

sdk/lib/_internal/pub/test/dart2js/outputs_deferred_libraries_test.dart

 // Copyright (c) 2014, 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.
 
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 
 const MAIN = """
 import 'dart:async';
 
-@lazyA import 'a.dart' as a;
-@lazyB import 'b.dart' as b;
-
-const lazyA = const DeferredLibrary('a', uri: 'a.js');
-const lazyB = const DeferredLibrary('b', uri: 'b.js');
+import 'a.dart' deferred as a;
+import 'b.dart' deferred as b;
 
 void main() {
-  Future.wait([lazyA.load(), lazyB.load()]).then((_) {
+  Future.wait([lazyA.loadLibrary(), lazyB.loadLibrary()]).then((_) {
     a.fn();
     b.fn();
   });
 }
 """;
 
 const A = """
 library a;
 
 fn() => print("a");
@@ skipping 22 matching lines @@
     ]).create();
 
     schedulePub(args: ["build"],
         output: new RegExp(r'Built 4 files to "build".'));
 
     d.dir(appPath, [
       d.dir('build', [
         d.dir('web', [
           d.matcherFile('main.dart.js', isNot(isEmpty)),
           d.matcherFile('main.dart.precompiled.js', isNot(isEmpty)),
-          d.matcherFile('main.dart.js_a.part.js', isNot(isEmpty)),
-          d.matcherFile('main.dart.js_b.part.js', isNot(isEmpty)),
+          d.matcherFile('main.dart.js_1.part.js', isNot(isEmpty)),
+          d.matcherFile('main.dart.js_2.part.js', isNot(isEmpty)),
         ])
       ])
     ]).validate();
   });
 }