Change Platform members to getters instead of methods.

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:builtin");
 #import("drt_updater.dart");
 
@@ skipping 95 matching lines @@
               'arch',
               'The architecture to run tests for',
               ['-a', '--arch'],
               ['all', 'ia32', 'x64', 'simarm'],
               'ia32'),
           new _TestOptionSpecification(
               'system',
               'The operating system to run tests on',
               ['-s', '--system'],
               ['linux', 'macos', 'windows'],
-              Platform.operatingSystem()),
+              Platform.operatingSystem),
           new _TestOptionSpecification(
               'checked',
               'Run tests in checked mode',
               ['--checked'],
               [],
               false,
               'bool'),
           new _TestOptionSpecification(
               'host_checked',
               'Run compiler in checked mode',
@@ skipping 20 matching lines @@
               'Print a summary report of the number of tests, by expectation',
               ['--report'],
               [],
               false,
               'bool'),
           new _TestOptionSpecification(
               'tasks',
               'The number of parallel tasks to run',
               ['-j', '--tasks'],
               [],
-              Platform.numberOfProcessors(),
+              Platform.numberOfProcessors,
               'int'),
           new _TestOptionSpecification(
               'shards',
               'The number of instances that the tests will be sharded over',
               ['--shards'],
               [],
               1,
               'int'),
           new _TestOptionSpecification(
               'shard',
@@ skipping 243 matching lines @@
           break;
         case 'none':
           isValid = (const ['vm', 'drt',
                             'dartium']).indexOf(config['runtime']) >= 0;
       }
     if (!isValid) {
       print("Warning: combination of ${config['compiler']} and " +
           "${config['runtime']} is invalid. Skipping this combination.");
     }
     if (config['runtime'] == 'ie' &&
-        Platform.operatingSystem() != 'windows') {
+        Platform.operatingSystem != 'windows') {
       isValid = false;
       print("Warning cannot run Internet Explorer on non-Windows operating" +
           " system.");
     }
     if (config['shard'] < 1 || config['shard'] > config['shards']) {
       isValid = false;
       print("Error: shard index is ${config['shard']} out of " + 
             "${config['shards']} shards");
     }
     if (config['runtime'] == 'dartium' && config['compiler'] == 'none' &&
@@ skipping 208 matching lines @@
         return option;
       }
     }
     print('Unknown test option $name');
     exit(1);
   }
 
 
   List<_TestOptionSpecification> _options;
 }