Sheriff-O-Matic: Fix karma for testing

Tools/GardeningServer/test/karma_loader.html

Index: Tools/GardeningServer/test/karma_loader.html
diff --git a/Tools/GardeningServer/polymer-load-warning.html b/Tools/GardeningServer/test/karma_loader.html
similarity index 50%
copy from Tools/GardeningServer/polymer-load-warning.html
copy to Tools/GardeningServer/test/karma_loader.html
index 7e3625e685e947a40e203a3b50ea958e3a80816c..8b377eff3a312a394de163ff47c9883c4a919d5f 100644
--- a/Tools/GardeningServer/polymer-load-warning.html
+++ b/Tools/GardeningServer/test/karma_loader.html
@@ -4,7 +4,10 @@ Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 -->
 
+<link rel="import" href="../bower_components/polymer/polymer.html">
+
 <script>
-if (!window.Polymer)
-    alert('Polymer did not load correctly. Did you run "bower update" from Tools/GardeningServer?');
+window.__karma__.loaded = function() {
+  window.addEventListener('polymer-ready', window.__karma__.start);
+};
 </script>