Add script to remove prefixed CSS from third_party/polymer.

third_party/polymer/v1_0/components-chromium/paper-styles/typography.html

 <!--
 @license
 Copyright (c) 2015 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
 -->
 
 <link rel="import" href="../polymer/polymer.html">
 <link rel="import" href="../font-roboto/roboto.html">
 
 <style is="custom-style">
 
   :root {
 
     /* Shared Styles */
     --paper-font-common-base: {
       font-family: 'Roboto', 'Noto', sans-serif;
-      -webkit-font-smoothing: antialiased;
     };
 
     --paper-font-common-code: {
       font-family: 'Roboto Mono', 'Consolas', 'Menlo', monospace;
-      -webkit-font-smoothing: antialiased;
     };
 
     --paper-font-common-expensive-kerning: {
       text-rendering: optimizeLegibility;
     };
 
     --paper-font-common-nowrap: {
       white-space: nowrap;
       overflow: hidden;
       text-overflow: ellipsis;
@@ skipping 123 matching lines @@
       @apply(--paper-font-common-code);
 
       font-size: 14px;
       font-weight: 500;
       line-height: 20px;
     };
 
   }
 
 </style>