Remove GardeningServer.

Tools/GardeningServer/ui/ct-chart.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="../lib/chart-loader.html">
-
-<polymer-element name="ct-chart" attributes="table options width height">
-  <template>
-    <canvas id='chart' width="{{ width }}" height="{{ height }}"></canvas>
-  </template>
-  <script>
-    Polymer({
-      table: null,
-      options: null,
-      observe: {
-        options: 'updateChart',
-        table: 'updateChart'
-      },
-      updateChart: function() {
-        if (this.table == null || this.options == null) {
-          return;
-        }
-        var ctx = this.$.chart.getContext("2d");
-        new Chart(ctx).Bar(this.table, this.options);
-      }
-    });
-  </script>
-</template>