Run third_party/polymer/reproduce.sh to pick up vuicanize changes.

third_party/polymer/components-chromium/core-menu-button/core-menu-button.html

 <!--
 Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 --><!--
 
 `core-menu-button` works together with a button and `core-dropdown` to implement
@@ skipping 43 matching lines @@
     }
   </style>
 
   <core-a11y-keys target="{{}}" keys="enter space" on-keys-pressed="{{toggleOverlay}}"></core-a11y-keys>
 
   <content></content>
 
 </template>
 
 </polymer-element>
-<script src="core-menu-button-extracted.js"></script></body></html>
+<script charset="utf-8" src="core-menu-button-extracted.js"></script></body></html>