Add script to remove prefixed CSS from third_party/polymer.

third_party/polymer/v1_0/components-chromium/iron-flex-layout/iron-flex-layout-classes.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
 -->
 
@@ skipping 19 matching lines @@
 -->
 
 <link rel="import" href="../polymer/polymer.html">
 
 <!-- Most common used flex styles-->
 <dom-module id="iron-flex">
   <template>
     <style>
       .layout.horizontal,
       .layout.vertical {
-        display: -ms-flexbox;
-        display: -webkit-flex;
         display: flex;
       }
 
       .layout.inline {
-        display: -ms-inline-flexbox;
-        display: -webkit-inline-flex;
         display: inline-flex;
       }
 
       .layout.horizontal {
-        -ms-flex-direction: row;
-        -webkit-flex-direction: row;
         flex-direction: row;
       }
 
       .layout.vertical {
-        -ms-flex-direction: column;
-        -webkit-flex-direction: column;
         flex-direction: column;
       }
 
       .layout.wrap {
-        -ms-flex-wrap: wrap;
-        -webkit-flex-wrap: wrap;
         flex-wrap: wrap;
       }
 
       .layout.center,
       .layout.center-center {
-        -ms-flex-align: center;
-        -webkit-align-items: center;
         align-items: center;
       }
 
       .layout.center-justified,
       .layout.center-center {
-        -ms-flex-pack: center;
-        -webkit-justify-content: center;
         justify-content: center;
       }
 
       .flex {
-        -ms-flex: 1 1 0.000000001px;
-        -webkit-flex: 1;
         flex: 1;
-        -webkit-flex-basis: 0.000000001px;
         flex-basis: 0.000000001px;
       }
 
       .flex-auto {
-        -ms-flex: 1 1 auto;
-        -webkit-flex: 1 1 auto;
         flex: 1 1 auto;
       }
 
       .flex-none {
-        -ms-flex: none;
-        -webkit-flex: none;
         flex: none;
       }
     </style>
   </template>
 </dom-module>
 
 <!-- Basic flexbox reverse styles -->
 <dom-module id="iron-flex-reverse">
   <template>
     <style>
       .layout.horizontal-reverse,
       .layout.vertical-reverse {
-        display: -ms-flexbox;
-        display: -webkit-flex;
         display: flex;
       }
 
       .layout.horizontal-reverse {
-        -ms-flex-direction: row-reverse;
-        -webkit-flex-direction: row-reverse;
         flex-direction: row-reverse;
       }
 
       .layout.vertical-reverse {
-        -ms-flex-direction: column-reverse;
-        -webkit-flex-direction: column-reverse;
         flex-direction: column-reverse;
       }
 
       .layout.wrap-reverse {
-        -ms-flex-wrap: wrap-reverse;
-        -webkit-flex-wrap: wrap-reverse;
         flex-wrap: wrap-reverse;
       }
     </style>
   </template>
 </dom-module>
 
 <!-- Flexbox alignment -->
 <dom-module id="iron-flex-alignment">
   <template>
     <style>
       /**
        * Alignment in cross axis.
        */
       .layout.start {
-        -ms-flex-align: start;
-        -webkit-align-items: flex-start;
         align-items: flex-start;
       }
 
       .layout.center,
       .layout.center-center {
-        -ms-flex-align: center;
-        -webkit-align-items: center;
         align-items: center;
       }
 
       .layout.end {
-        -ms-flex-align: end;
-        -webkit-align-items: flex-end;
         align-items: flex-end;
       }
 
       .layout.baseline {
-        -ms-flex-align: baseline;
-        -webkit-align-items: baseline;
         align-items: baseline;
       }
 
       /**
        * Alignment in main axis.
        */
       .layout.start-justified {
-        -ms-flex-pack: start;
-        -webkit-justify-content: flex-start;
         justify-content: flex-start;
       }
 
       .layout.center-justified,
       .layout.center-center {
-        -ms-flex-pack: center;
-        -webkit-justify-content: center;
         justify-content: center;
       }
 
       .layout.end-justified {
-        -ms-flex-pack: end;
-        -webkit-justify-content: flex-end;
         justify-content: flex-end;
       }
 
       .layout.around-justified {
-        -ms-flex-pack: distribute;
-        -webkit-justify-content: space-around;
         justify-content: space-around;
       }
 
       .layout.justified {
-        -ms-flex-pack: justify;
-        -webkit-justify-content: space-between;
         justify-content: space-between;
       }
 
       /**
        * Self alignment.
        */
       .self-start {
-        -ms-align-self: flex-start;
-        -webkit-align-self: flex-start;
         align-self: flex-start;
       }
 
       .self-center {
-        -ms-align-self: center;
-        -webkit-align-self: center;
         align-self: center;
       }
 
       .self-end {
-        -ms-align-self: flex-end;
-        -webkit-align-self: flex-end;
         align-self: flex-end;
       }
 
       .self-stretch {
-        -ms-align-self: stretch;
-        -webkit-align-self: stretch;
         align-self: stretch;
       }
 
       .self-baseline {
-        -ms-align-self: baseline;
-        -webkit-align-self: baseline;
         align-self: baseline;
       };
 
       /**
        * multi-line alignment in main axis.
        */
       .layout.start-aligned {
-        -ms-flex-line-pack: start;  /* IE10 */
-        -ms-align-content: flex-start;
-        -webkit-align-content: flex-start;
         align-content: flex-start;
       }
 
       .layout.end-aligned {
-        -ms-flex-line-pack: end;  /* IE10 */
-        -ms-align-content: flex-end;
-        -webkit-align-content: flex-end;
         align-content: flex-end;
       }
 
       .layout.center-aligned {
-        -ms-flex-line-pack: center;  /* IE10 */
-        -ms-align-content: center;
-        -webkit-align-content: center;
         align-content: center;
       }
 
       .layout.between-aligned {
-        -ms-flex-line-pack: justify;  /* IE10 */
-        -ms-align-content: space-between;
-        -webkit-align-content: space-between;
         align-content: space-between;
       }
 
       .layout.around-aligned {
-        -ms-flex-line-pack: distribute;  /* IE10 */
-        -ms-align-content: space-around;
-        -webkit-align-content: space-around;
         align-content: space-around;
       }
     </style>
   </template>
 </dom-module>
 
 <dom-module id="iron-flex-factors">
   <template>
     <style>
       .flex,
       .flex-1 {
-        -ms-flex: 1 1 0.000000001px;
-        -webkit-flex: 1;
         flex: 1;
-        -webkit-flex-basis: 0.000000001px;
         flex-basis: 0.000000001px;
       }
 
       .flex-2 {
-        -ms-flex: 2;
-        -webkit-flex: 2;
         flex: 2;
       }
 
       .flex-3 {
-        -ms-flex: 3;
-        -webkit-flex: 3;
         flex: 3;
       }
 
       .flex-4 {
-        -ms-flex: 4;
-        -webkit-flex: 4;
         flex: 4;
       }
 
       .flex-5 {
-        -ms-flex: 5;
-        -webkit-flex: 5;
         flex: 5;
       }
 
       .flex-6 {
-        -ms-flex: 6;
-        -webkit-flex: 6;
         flex: 6;
       }
 
       .flex-7 {
-        -ms-flex: 7;
-        -webkit-flex: 7;
         flex: 7;
       }
 
       .flex-8 {
-        -ms-flex: 8;
-        -webkit-flex: 8;
         flex: 8;
       }
 
       .flex-9 {
-        -ms-flex: 9;
-        -webkit-flex: 9;
         flex: 9;
       }
 
       .flex-10 {
-        -ms-flex: 10;
-        -webkit-flex: 10;
         flex: 10;
       }
 
       .flex-11 {
-        -ms-flex: 11;
-        -webkit-flex: 11;
         flex: 11;
       }
 
       .flex-12 {
-        -ms-flex: 12;
-        -webkit-flex: 12;
         flex: 12;
       }
     </style>
   </template>
 </dom-module>
 
 <!-- Non-flexbox positioning helper styles -->
 <dom-module id="iron-positioning">
   <template>
     <style>
@@ skipping 59 matching lines @@
       }
 
       .fixed-left {
         top: 0;
         bottom: 0;
         left: 0;
       }
     </style>
   </template>
 </dom-module>