Make hasNext a getter instead of a method.

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 81 matching lines @@
       List settings =
           ['compiler', 'runtime', 'mode', 'arch'].map((name) => conf[name]);
       if (conf['checked']) settings.add('checked');
       output_words.add(Strings.join(settings, '_'));
     }
     print(Strings.join(output_words, ' '));
   }
 
   var configurationIterator = configurations.iterator();
   void enqueueConfiguration(ProcessQueue queue) {
-    if (!configurationIterator.hasNext()) return;
+    if (!configurationIterator.hasNext) return;
 
     var conf = configurationIterator.next();
     for (String key in selectors.getKeys()) {
       if (key == 'co19') {
         queue.addTestSuite(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]).
         queue.addTestSuite(new VMTestSuite(conf));
       } else if (conf['compiler'] == 'dartc' && key == 'dartc') {
@@ skipping 21 matching lines @@
                    progressIndicator,
                    startTime,
                    printTiming,
                    enqueueConfiguration,
                    () {
                      if (!listTests) terminateHttpServer();
                    },
                    verbose,
                    listTests);
 }