Change number of started browser processes to the max number of browser processes.

tools/test.dart

 #!/usr/bin/env dart
 // Copyright (c) 2013, 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 149 matching lines @@
     // There should not be more than one InternetExplorerDriver instance
     // running at a time. For details, see
     // http://code.google.com/p/selenium/wiki/InternetExplorerDriver.
     if (conf['runtime'].startsWith('ie')) {
       maxBrowserProcesses = 1;
     } else if (conf['runtime'].startsWith('safari') &&
                conf['use_browser_controller']) {
       // FIXME(kustermann/ricow): Remove this once the new browser_controller is
       // stable.
       maxBrowserProcesses = math.max(maxProcesses - 3, 1);
+      maxProcesses = math.max(maxProcesses -1, 1);
     }
 
     for (String key in selectors.keys) {
       if (key == 'co19') {
         testSuites.add(new Co19TestSuite(conf));
       } else if (conf['runtime'] == 'vm' && key == 'vm') {
         // vm tests contain both cc tests (added here) and dart tests (added
         // in [TEST_SUITE_DIRECTORIES]).
         testSuites.add(new VMTestSuite(conf));
       } else if (conf['analyzer']) {
@@ skipping 128 matching lines @@
 void main() {
   deleteTemporaryDartDirectories().then((_) {
     var optionsParser = new TestOptionsParser();
     var configurations = optionsParser.parse(new Options().arguments);
     if (configurations != null && configurations.length > 0) {
       testConfigurations(configurations);
     }
   });
 }