Remove unused class DirectoryTestSuite from test script.

tools/test.dart

 #!/usr/bin/env 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.
 
 /**
  * This file is the entrypoint of the dart test suite.  This suite is used
  * to test:
  *
  *     1. the dart vm
@@ skipping 33 matching lines @@
 #import("../frog/tests/frog/test_config.dart");
 #import("../frog/tests/leg/test_config.dart");
 #import("../frog/tests/leg_only/test_config.dart");
 #import("../frog/tests/native/test_config.dart");
 #import("../frog/tests/await/test_config.dart");
 #import("../utils/tests/css/test_config.dart");
 #import("../utils/tests/import_mapper/test_config.dart");
 
 /**
  * The directories that contain test suites which follow the conventions
- * required by [DirectoryTestSuite]. Ideally, we'd move more suites to this
- * convention because it makes it much simpler to add them to test.dart. (You
- * basically add the directory here and you're done.)
+ * required by [StandardTestSuite]'s forDirectory constructor.

[Mads Ager (google), 2012/04/25 10:51:16]

Are these two tests suites below really the only ones that use the
StandardTestSuite? I really, really dislike having two ways of registering test
suites here. Either we make the two below follow the style of the rest or we
move almost everything here.

+ * New test suites should follow this convention because it makes it much
+ * simpler to add them to test.dart.  Existing test suites should be
+ * moved to here, if possible.
 */
 final TEST_SUITE_DIRECTORIES = const [
   'utils/tests/peg',
   'utils/tests/pub',
 ];
 
 main() {
   var startTime = new Date.now();
   var optionsParser = new TestOptionsParser();
   List<Map> configurations = optionsParser.parse(new Options().arguments);
@@ skipping 103 matching lines @@
   // Start process queue.
   var queue = new ProcessQueue(maxProcesses,
                                progressIndicator,
                                startTime,
                                printTiming,
                                enqueueConfiguration,
                                verbose,
                                listTests,
                                keepGeneratedTests);
 }