Revert "Load deferred chunks in the right order."

tests/compiler/dart2js_extra/deferred/deferred_overlapping_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 "deferred_overlapping_lib1.dart" deferred as lib1;
-import "deferred_overlapping_lib2.dart" deferred as lib2;
-
-// lib1.C1 and lib2.C2 has a shared base class It will go in its own hunk.
-// If lib1 or lib2s hunks are loaded before the common hunk, the program
-// will fail because the base class does not exist.
-void main() {
-  lib1.loadLibrary().then((_) {
-    var a = new lib1.C1();
-    lib2.loadLibrary().then((_) {
-      var b = new lib2.C2();
-    });
-  });
-}