"Set up directories.." commit below broke the buildbot tests, two others are collateral damage.

tools/testing/dart/test_configurations.dart

 // Copyright (c) 2012, 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 'dart:async';
 import 'dart:io';
 import 'dart:math' as math;
 
 import 'android.dart';
 import 'browser_controller.dart';
@@ skipping 21 matching lines @@
   new Path('runtime/observatory/tests/service'),
   new Path('runtime/observatory/tests/observatory_ui'),
   new Path('samples'),
   new Path('samples-dev'),
   new Path('tests/benchmark_smoke'),
   new Path('tests/chrome'),
   new Path('tests/compiler/dart2js'),
   new Path('tests/compiler/dart2js_extra'),
   new Path('tests/compiler/dart2js_native'),
   new Path('tests/corelib'),
-  new Path('tests/corelib_2'),
   new Path('tests/corelib_strong'),
   new Path('tests/html'),
   new Path('tests/isolate'),
   new Path('tests/kernel'),
   new Path('tests/language'),
   new Path('tests/language_strong'),
-  new Path('tests/language_2'),
   new Path('tests/lib'),
   new Path('tests/lib_strong'),
-  new Path('tests/lib_2'),
   new Path('tests/standalone'),
   new Path('tests/utils'),
   new Path('utils/tests/css'),
   new Path('utils/tests/peg'),
 ];
 
 // This file is created by gclient runhooks.
 final VS_TOOLCHAIN_FILE = new Path("build/win_toolchain.json");
 
 Future testConfigurations(List<Configuration> configurations) async {
@@ skipping 200 matching lines @@
   // Start all the HTTP servers required before starting the process queue.
   if (!serverFutures.isEmpty) {
     await Future.wait(serverFutures);
   }
 
   // [firstConf] is needed here, since the ProcessQueue needs to know the
   // settings of 'noBatch' and 'local_ip'
   new ProcessQueue(firstConf, maxProcesses, maxBrowserProcesses, startTime,
       testSuites, eventListener, allTestsFinished, verbose, adbDevicePool);
 }