Eliminate standalone timeout_test, pass_test, and fail_test.

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.
 
 #library("drt_updater");
 
 #import("dart:io");
-#import("dart:builtin");
 
 class _DartiumUpdater {
   String name;
   String script;
   String option;
 
   bool isActive = false;
   bool updated = false;
   List onUpdated;
 
@@ skipping 47 matching lines @@
     // Download the default Dartium from Google Storage.
     if (_dartiumUpdater === null) {
       _dartiumUpdater = new _DartiumUpdater('Dartium Chrome', 'get_drt.py',
                                             '--dartium');
     }
     return _dartiumUpdater;
   } else {
     return null;
   }
 }