Introduces the new syntax for deferred loading

tests/language/deferred_duplicate_prefix3_test.dart

Index: tests/language/deferred_duplicate_prefix3_test.dart
diff --git a/tests/language/deferred_duplicate_prefix3_test.dart b/tests/language/deferred_duplicate_prefix3_test.dart
index fb54f798d45c78fc9c401cc10c3d8e47c2dbc6be..dc3e85bc9ff3b0ff8996d4c48f25c84307876c0f 100644
--- a/tests/language/deferred_duplicate_prefix3_test.dart
+++ b/tests/language/deferred_duplicate_prefix3_test.dart
@@ -2,12 +2,7 @@
 // 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 "dart:async";
-
-@lazy import "deferred_prefix_constraints_lib.dart" as lib;
-@lazy2 import "deferred_prefix_constraints_lib2.dart" as lib; /// 01: compile-time error
-
-const lazy = const DeferredLibrary('lib');
-const lazy2 = const DeferredLibrary('lib2');
+import "deferred_prefix_constraints_lib.dart" deferred as lib; /// 01: compile-time error
+import "deferred_prefix_constraints_lib2.dart" deferred as lib; /// 01: continued
 
 void main() {}