Remove GardeningServer.

Tools/GardeningServer/ui/ct-tree-select.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-tree-select" attributes="tree treeList">
-  <template>
-    <select id='treeSelect' on-change="{{ _updateTree }}" value="{{ tree }}">
-      <template repeat="{{ s in treeList.trees }}">
-        <option value="{{ s.name }}">{{ s.displayName }}</option>
-      </template>
-    </select>
-  </template>
-  <script>
-  (function() {
-    Polymer({
-      publish: {
-        tree: {
-          reflect: true,
-        },
-      },
-
-      _updateTree: function(event) {
-        this.asyncFire('navigate', {
-          url: event.target.value
-        });
-      },
-
-      treeChanged: function() {
-        if (!this.tree.length)
-          return;
-
-        // Enforce the tree list, so we don't show a blank select value.
-        var option = this.$.treeSelect.querySelector('option[value="' + this.tree + '"]');
-        if (!option) {
-          // URL is incorrect. Replace with the root so we use the default tree.
-          this.asyncFire('navigate', {
-            url: '/',
-            replaceState: true
-          });
-        }
-      },
-    });
-  })();
-  </script>
-</polymer-element>