Update searchable_list test to run in package bots

web/elements/searchable_list.dart

-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-library searchable_list.searchable_list;
-
-import 'package:polymer/polymer.dart';
-
-@CustomTag('searchable-list')
-class SearchableList extends PolymerElement {
-  @observable bool applyAuthorStyles = true;
-  @observable String searchParam;
-  @published List<String> data = [];
-  final List<String> results = toObservable([]);
-
-  SearchableList.created() : super.created();
-
-  attached() {
-    super.attached();
-    results.addAll(data);
-    onPropertyChange(this, #searchParam, search);
-  }
-
-  search() {
-    results.clear();
-    String lower = searchParam.toLowerCase();
-    results.addAll(data.where((d) => d.toLowerCase().contains(lower)));
-  }
-}