Update checked-in binary to 0.6.21.3_r26639 (M6)

dart/tools/testing/dart/drt_updater.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.
 
 // TODO(antonm): rename to something like test_runner_updater.
 
 library drt_updater;
 
 import "dart:async";
 import "dart:io";
 
 import "test_suite.dart";
+import "utils.dart" show Path;
 
 class _DartiumUpdater {
   String name;
   String script;
   String option;
 
   bool isActive = false;
   bool updated = false;
   List onUpdated;
 
@@ skipping 55 matching lines @@
     // Download the default Dartium from Google Storage.
     if (_dartiumUpdater == null) {
       _dartiumUpdater = new _DartiumUpdater('Dartium Chrome', 'get_archive.py',
                                             'dartium');
     }
     return _dartiumUpdater;
   } else {
     return null;
   }
 }