Add script to remove prefixed CSS from third_party/polymer.

third_party/polymer/v1_0/components-chromium/paper-spinner/paper-spinner-styles.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 31 matching lines @@
         height: 100%;
 
         /* The spinner does not have any contents that would have to be
          * flipped if the direction changes. Always use ltr so that the
          * style works out correctly in both cases. */
         direction: ltr;
       }
 
       #spinnerContainer.active {
         /* duration: 360 * ARCTIME / (ARCSTARTROT + (360-ARCSIZE)) */
-        -webkit-animation: container-rotate 1568ms linear infinite;
         animation: container-rotate 1568ms linear infinite;
       }
 
-      @-webkit-keyframes container-rotate {
-        to { -webkit-transform: rotate(360deg) }
-      }
 
       @keyframes container-rotate {
         to { transform: rotate(360deg) }
       }
 
       .spinner-layer {
         position: absolute;
         width: 100%;
         height: 100%;
         opacity: 0;
@@ skipping 20 matching lines @@
       /**
        * IMPORTANT NOTE ABOUT CSS ANIMATION PROPERTIES (keanulee):
        *
        * iOS Safari (tested on iOS 8.1) does not handle animation-delay very well - it doesn't
        * guarantee that the animation will start _exactly_ after that value. So we avoid using
        * animation-delay and instead set custom keyframes for each color (as layer-2undant as it
        * seems).
        *
        * We write out each animation in full (instead of separating animation-name,
        * animation-duration, etc.) because under the polyfill, Safari does not recognize those
-       * specific properties properly, treats them as -webkit-animation, and overrides the
        * other animation rules. See https://github.com/Polymer/platform/issues/53.
        */
       .active .spinner-layer {
         /* durations: 4 * ARCTIME */
-        -webkit-animation: fill-unfill-rotate 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
         animation: fill-unfill-rotate 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
         opacity: 1;
       }
 
       .active .spinner-layer.layer-1 {
         /* durations: 4 * ARCTIME */
-        -webkit-animation: fill-unfill-rotate 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both, layer-1-fade-in-out 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
         animation: fill-unfill-rotate 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both, layer-1-fade-in-out 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
       }
 
       .active .spinner-layer.layer-2 {
         /* durations: 4 * ARCTIME */
-        -webkit-animation: fill-unfill-rotate 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both, layer-2-fade-in-out 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
         animation: fill-unfill-rotate 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both, layer-2-fade-in-out 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
       }
 
       .active .spinner-layer.layer-3 {
         /* durations: 4 * ARCTIME */
-        -webkit-animation: fill-unfill-rotate 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both, layer-3-fade-in-out 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
         animation: fill-unfill-rotate 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both, layer-3-fade-in-out 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
       }
 
       .active .spinner-layer.layer-4 {
         /* durations: 4 * ARCTIME */
-        -webkit-animation: fill-unfill-rotate 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both, layer-4-fade-in-out 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
         animation: fill-unfill-rotate 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both, layer-4-fade-in-out 5332ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
       }
 
-      @-webkit-keyframes fill-unfill-rotate {
-        12.5% { -webkit-transform: rotate(135deg);  } /* 0.5 * ARCSIZE */
-        25%   { -webkit-transform: rotate(270deg);  } /* 1   * ARCSIZE */
-        37.5% { -webkit-transform: rotate(405deg);  } /* 1.5 * ARCSIZE */
-        50%   { -webkit-transform: rotate(540deg);  } /* 2   * ARCSIZE */
-        62.5% { -webkit-transform: rotate(675deg);  } /* 2.5 * ARCSIZE */
-        75%   { -webkit-transform: rotate(810deg);  } /* 3   * ARCSIZE */
-        87.5% { -webkit-transform: rotate(945deg);  } /* 3.5 * ARCSIZE */
-        to    { -webkit-transform: rotate(1080deg); } /* 4   * ARCSIZE */
-      }
 
       @keyframes fill-unfill-rotate {
         12.5% { transform: rotate(135deg);  } /* 0.5 * ARCSIZE */
         25%   { transform: rotate(270deg);  } /* 1   * ARCSIZE */
         37.5% { transform: rotate(405deg);  } /* 1.5 * ARCSIZE */
         50%   { transform: rotate(540deg);  } /* 2   * ARCSIZE */
         62.5% { transform: rotate(675deg);  } /* 2.5 * ARCSIZE */
         75%   { transform: rotate(810deg);  } /* 3   * ARCSIZE */
         87.5% { transform: rotate(945deg);  } /* 3.5 * ARCSIZE */
         to    { transform: rotate(1080deg); } /* 4   * ARCSIZE */
       }
 
       /**
        * HACK: Even though the intention is to have the current .spinner-layer at
        * `opacity: 1`, we set it to `opacity: 0.99` instead since this forces Chrome
        * to do proper subpixel rendering for the elements being animated. This is
        * especially visible in Chrome 39 on Ubuntu 14.04. See:
        *
        * - https://github.com/Polymer/paper-spinner/issues/9
        * - https://code.google.com/p/chromium/issues/detail?id=436255
        */
-      @-webkit-keyframes layer-1-fade-in-out {
-        from { opacity: 0.99; }
-        25% { opacity: 0.99; }
-        26% { opacity: 0; }
-        89% { opacity: 0; }
-        90% { opacity: 0.99; }
-        100% { opacity: 0.99; }
-      }
 
       @keyframes layer-1-fade-in-out {
         from { opacity: 0.99; }
         25% { opacity: 0.99; }
         26% { opacity: 0; }
         89% { opacity: 0; }
         90% { opacity: 0.99; }
         100% { opacity: 0.99; }
       }
 
-      @-webkit-keyframes layer-2-fade-in-out {
-        from { opacity: 0; }
-        15% { opacity: 0; }
-        25% { opacity: 0.99; }
-        50% { opacity: 0.99; }
-        51% { opacity: 0; }
-      }
 
       @keyframes layer-2-fade-in-out {
         from { opacity: 0; }
         15% { opacity: 0; }
         25% { opacity: 0.99; }
         50% { opacity: 0.99; }
         51% { opacity: 0; }
       }
 
-      @-webkit-keyframes layer-3-fade-in-out {
-        from { opacity: 0; }
-        40% { opacity: 0; }
-        50% { opacity: 0.99; }
-        75% { opacity: 0.99; }
-        76% { opacity: 0; }
-      }
 
       @keyframes layer-3-fade-in-out {
         from { opacity: 0; }
         40% { opacity: 0; }
         50% { opacity: 0.99; }
         75% { opacity: 0.99; }
         76% { opacity: 0; }
       }
 
-      @-webkit-keyframes layer-4-fade-in-out {
-        from { opacity: 0; }
-        65% { opacity: 0; }
-        75% { opacity: 0.99; }
-        90% { opacity: 0.99; }
-        100% { opacity: 0; }
-      }
 
       @keyframes layer-4-fade-in-out {
         from { opacity: 0; }
         65% { opacity: 0; }
         75% { opacity: 0.99; }
         90% { opacity: 0.99; }
         100% { opacity: 0; }
       }
 
       /**
@@ skipping 33 matching lines @@
       }
 
       .circle {
         box-sizing: border-box;
         height: 100%;
         border-width: 3px; /* STROKEWIDTH */
         border-style: solid;
         border-color: inherit;
         border-bottom-color: transparent !important;
         border-radius: 50%;
-        -webkit-animation: none;
         animation: none;
 
         @apply(--layout-fit);
       }
 
       .circle-clipper.left .circle {
         border-right-color: transparent !important;
-        -webkit-transform: rotate(129deg);
         transform: rotate(129deg);
       }
 
       .circle-clipper.right .circle {
         left: -100%;
         border-left-color: transparent !important;
-        -webkit-transform: rotate(-129deg);
         transform: rotate(-129deg);
       }
 
       .active .circle-clipper.left .circle {
         /* duration: ARCTIME */
-        -webkit-animation: left-spin 1333ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
         animation: left-spin 1333ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
       }
 
       .active .circle-clipper.right .circle {
         /* duration: ARCTIME */
-        -webkit-animation: right-spin 1333ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
         animation: right-spin 1333ms cubic-bezier(0.4, 0.0, 0.2, 1) infinite both;
       }
 
-      @-webkit-keyframes left-spin {
-        from { -webkit-transform: rotate(130deg); }
-        50% { -webkit-transform: rotate(-5deg); }
-        to { -webkit-transform: rotate(130deg); }
-      }
 
       @keyframes left-spin {
         from { transform: rotate(130deg); }
         50% { transform: rotate(-5deg); }
         to { transform: rotate(130deg); }
       }
 
-      @-webkit-keyframes right-spin {
-        from { -webkit-transform: rotate(-130deg); }
-        50% { -webkit-transform: rotate(5deg); }
-        to { -webkit-transform: rotate(-130deg); }
-      }
 
       @keyframes right-spin {
         from { transform: rotate(-130deg); }
         50% { transform: rotate(5deg); }
         to { transform: rotate(-130deg); }
       }
 
       #spinnerContainer.cooldown {
         /* duration: SHRINK_TIME */
-        -webkit-animation: container-rotate 1568ms linear infinite, fade-out 400ms cubic-bezier(0.4, 0.0, 0.2, 1);
         animation: container-rotate 1568ms linear infinite, fade-out 400ms cubic-bezier(0.4, 0.0, 0.2, 1);
       }
 
-      @-webkit-keyframes fade-out {
-        from { opacity: 0.99; }
-        to { opacity: 0; }
-      }
 
       @keyframes fade-out {
         from { opacity: 0.99; }
         to { opacity: 0; }
       }
     </style>
   </template>
 </dom-module>