Use the new test runner.

test/cache/repair/empty_cache_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.
 
 library pub_tests;
 
 import '../../test_pub.dart';
 
 main() {
-  initConfig();
   integration('does nothing if the cache is empty', () {
     // Repair them.
     schedulePub(args: ["cache", "repair"],
         output: "No packages in cache, so nothing to repair.");
   });
 }