Remove the Dromaeo and TodoMVC samples.

samples/third_party/todomvc_performance/web/lib-elements/polymer_localstorage.html

-<!--
-Copyright 2013 The Polymer 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-localstorage provides access to localStorage.
- *
- * Example:
- *
- *     <polymer-localstorage name="my-app-storage" value="{{value}}">
- *     </polymer-localstorage>
- */
--->
-<polymer-element name="polymer-localstorage">
-  <template>
-    <style>
-      @host {
-        * {
-          display: none;
-        }
-      }
-    </style>
-  </template>
-  <script type="application/dart" src="polymer_localstorage.dart"></script>
-</polymer-element>