Remove GardeningServer.

Tools/GardeningServer/ui/ct-last-updated.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.
--->
-
-<polymer-element name="ct-last-updated" attributes="date">
-  <template>
-    <template if="{{ date }}">
-      <style>
-        .stale_5minutes {
-          color: orange;
-        }
-        .stale_10minutes {
-          color: red;
-        }
-        .stale_20minutes {
-          background-color: red;
-          color: black;
-        }
-      </style>
-      <span class="{{ date | _style }}">Updated @ {{ date | _hours }}:{{ date | _minutes }}</div>
-    </template>
-  </template>
-  <script>
-  (function() {
-    Polymer({
-      date: null,
-      _style: function(date) {
-        var staleness = date.minutesAgo();
-        if (staleness >= 20)
-          return "stale_20minutes";
-        if (staleness >= 10)
-          return "stale_10minutes";
-        if (staleness >= 5)
-          return "stale_5minutes";
-        return "";
-      },
-
-      _hours: function(date) {
-        return date.getHours();
-      },
-      _minutes: function(date) {
-        return date.getMinutes().toString().padLeft(2, '0');
-      },
-    });
-  })();
-
-  </script>
-</polymer-element>