Add script to remove prefixed CSS from third_party/polymer.

third_party/polymer/v1_0/components-chromium/paper-styles/classes/shadow-layout.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
 -->
 <style>
 
   /*******************************
             Flex Layout
   *******************************/
 
   html /deep/ .layout.horizontal,
   html /deep/ .layout.horizontal-reverse,
   html /deep/ .layout.vertical,
   html /deep/ .layout.vertical-reverse {
-    display: -ms-flexbox;
-    display: -webkit-flex;
     display: flex;
   }
 
   html /deep/ .layout.inline {
-    display: -ms-inline-flexbox;
-    display: -webkit-inline-flex;
     display: inline-flex;
   }
 
   html /deep/ .layout.horizontal {
-    -ms-flex-direction: row;
-    -webkit-flex-direction: row;
     flex-direction: row;
   }
 
   html /deep/ .layout.horizontal-reverse {
-    -ms-flex-direction: row-reverse;
-    -webkit-flex-direction: row-reverse;
     flex-direction: row-reverse;
   }
 
   html /deep/ .layout.vertical {
-    -ms-flex-direction: column;
-    -webkit-flex-direction: column;
     flex-direction: column;
   }
 
   html /deep/ .layout.vertical-reverse {
-    -ms-flex-direction: column-reverse;
-    -webkit-flex-direction: column-reverse;
     flex-direction: column-reverse;
   }
 
   html /deep/ .layout.wrap {
-    -ms-flex-wrap: wrap;
-    -webkit-flex-wrap: wrap;
     flex-wrap: wrap;
   }
 
   html /deep/ .layout.wrap-reverse {
-    -ms-flex-wrap: wrap-reverse;
-    -webkit-flex-wrap: wrap-reverse;
     flex-wrap: wrap-reverse;
   }
 
   html /deep/ .flex-auto {
-    -ms-flex: 1 1 auto;
-    -webkit-flex: 1 1 auto;
     flex: 1 1 auto;
   }
 
   html /deep/ .flex-none {
-    -ms-flex: none;
-    -webkit-flex: none;
     flex: none;
   }
 
   html /deep/ .flex,
   html /deep/ .flex-1 {
-    -ms-flex: 1;
-    -webkit-flex: 1;
     flex: 1;
   }
 
   html /deep/ .flex-2 {
-    -ms-flex: 2;
-    -webkit-flex: 2;
     flex: 2;
   }
 
   html /deep/ .flex-3 {
-    -ms-flex: 3;
-    -webkit-flex: 3;
     flex: 3;
   }
 
   html /deep/ .flex-4 {
-    -ms-flex: 4;
-    -webkit-flex: 4;
     flex: 4;
   }
 
   html /deep/ .flex-5 {
-    -ms-flex: 5;
-    -webkit-flex: 5;
     flex: 5;
   }
 
   html /deep/ .flex-6 {
-    -ms-flex: 6;
-    -webkit-flex: 6;
     flex: 6;
   }
 
   html /deep/ .flex-7 {
-    -ms-flex: 7;
-    -webkit-flex: 7;
     flex: 7;
   }
 
   html /deep/ .flex-8 {
-    -ms-flex: 8;
-    -webkit-flex: 8;
     flex: 8;
   }
 
   html /deep/ .flex-9 {
-    -ms-flex: 9;
-    -webkit-flex: 9;
     flex: 9;
   }
 
   html /deep/ .flex-10 {
-    -ms-flex: 10;
-    -webkit-flex: 10;
     flex: 10;
   }
 
   html /deep/ .flex-11 {
-    -ms-flex: 11;
-    -webkit-flex: 11;
     flex: 11;
   }
 
   html /deep/ .flex-12 {
-    -ms-flex: 12;
-    -webkit-flex: 12;
     flex: 12;
   }
 
   /* alignment in cross axis */
 
   html /deep/ .layout.start {
-    -ms-flex-align: start;
-    -webkit-align-items: flex-start;
     align-items: flex-start;
   }
 
   html /deep/ .layout.center,
   html /deep/ .layout.center-center {
-    -ms-flex-align: center;
-    -webkit-align-items: center;
     align-items: center;
   }
 
   html /deep/ .layout.end {
-    -ms-flex-align: end;
-    -webkit-align-items: flex-end;
     align-items: flex-end;
   }
 
   /* alignment in main axis */
 
   html /deep/ .layout.start-justified {
-    -ms-flex-pack: start;
-    -webkit-justify-content: flex-start;
     justify-content: flex-start;
   }
 
   html /deep/ .layout.center-justified,
   html /deep/ .layout.center-center {
-    -ms-flex-pack: center;
-    -webkit-justify-content: center;
     justify-content: center;
   }
 
   html /deep/ .layout.end-justified {
-    -ms-flex-pack: end;
-    -webkit-justify-content: flex-end;
     justify-content: flex-end;
   }
 
   html /deep/ .layout.around-justified {
-    -ms-flex-pack: around;
-    -webkit-justify-content: space-around;
     justify-content: space-around;
   }
 
   html /deep/ .layout.justified {
-    -ms-flex-pack: justify;
-    -webkit-justify-content: space-between;
     justify-content: space-between;
   }
 
   /* self alignment */
 
   html /deep/ .self-start {
-    -ms-align-self: flex-start;
-    -webkit-align-self: flex-start;
     align-self: flex-start;
   }
 
   html /deep/ .self-center {
-    -ms-align-self: center;
-    -webkit-align-self: center;
     align-self: center;
   }
 
   html /deep/ .self-end {
-    -ms-align-self: flex-end;
-    -webkit-align-self: flex-end;
     align-self: flex-end;
   }
 
   html /deep/ .self-stretch {
-    -ms-align-self: stretch;
-    -webkit-align-self: stretch;
     align-self: stretch;
   }
 
   /*******************************
             Other Layout
   *******************************/
 
   html /deep/ .block {
     display: block;
   }
@@ skipping 54 matching lines @@
     left: 0;
   }
 
   html /deep/ .fixed-left {
     top: 0;
     bottom: 0;
     left: 0;
   }
 
 </style>