Clean up test.dart framework.

tools/testing/dart/test_options.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("test_options_parser");
 
 #import("dart:io");
 #import("dart:math");
 #import("drt_updater.dart");
 #import("test_suite.dart");
@@ skipping 458 matching lines @@
     // Create the artificial 'unchecked' options that test status files
     // expect.
     configuration['unchecked'] = !configuration['checked'];
     configuration['host_unchecked'] = !configuration['host_checked'];
 
     String runtime = configuration['runtime'];
     if (runtime == 'firefox') {
       configuration['runtime'] == 'ff';
     }
 
-    configuration['browser'] = TestUtils.isBrowserRuntime(runtime);
-
     // Set the javascript command line flag for less verbose status files.
     configuration['jscl'] = TestUtils.isJsCommandLineRuntime(runtime);
 
     // Expand the test selectors into a suite name and a simple
     // regular expressions to be used on the full path of a test file
     // in that test suite. If no selectors are explicitly given use
     // the default suite patterns.
     var selectors = configuration['selectors'];
     if (selectors is !Map) {
       if (selectors == null) {
@@ skipping 158 matching lines @@
         return option;
       }
     }
     print('Unknown test option $name');
     exit(1);
   }
 
 
   List<_TestOptionSpecification> _options;
 }