[Sheriff-o-matic] Remove race condition on the commit list.

Tools/GardeningServer/model/test/ct-commit-list-tests.html

 <!--
 Copyright 2014 The Chromium Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 -->
 
 <link rel="import" href="../ct-commit-list.html">
 
 <script>
 (function () {
@@ skipping 46 matching lines @@
               'blink': 158545
             },
             lastPassingRevisions: {
               'blink': 158544
             }
           }
         ]
       };
 
       var cl = new CTCommitList(group, new CTCommitLogMock());
-      var repos = cl.repositories();
+      var repos = cl.repositories;
       assert.lengthOf(repos, 1);
       assert.equal(repos[0].name, 'blink');
       assert.lengthOf(repos[0].commits, 1);
       assert.equal(repos[0].range, '158545 : 158545')
     });
   });
 });
 
 })();
 </script>