Convert moar Sheriff-o-Matic tests to Polymer.

Tools/GardeningServer/model/tree-status-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="tree-status.html">
 
 <script>
 
@@ skipping 18 matching lines @@
 
 var closedTreeJson = {
   "username": "ojan@chromium.org",
   "date": "2013-10-14 20:32:09.642350",
   "message": "Tree is closed",
   "can_commit_freely": false,
   "general_state": "closed"
 };
 
 asyncTest("basic", 6, function() {
-  var simulator = new NetworkSimulator();
+  var simulator = new NetworkSimulator(ok, start);
   simulator.json = function(url) {
     if (url.indexOf('closed') != -1)
       return Promise.resolve(closedTreeJson);
     else if (url.indexOf('throttled') != -1)
       return Promise.resolve(throttledTreeJson);
     else
       return Promise.resolve(openTreeJson);
   };
 
   var opentree = new TreeStatus("open-tree-project");
@@ skipping 18 matching lines @@
     ]).then(function() {
       requestAnimationFrame(function() {
         start();
       });
     });
   });
 });
 
 })();
 </script>