Add script to remove prefixed CSS from third_party/polymer.

third_party/polymer/v1_0/components-chromium/paper-progress/paper-progress.html

Index: third_party/polymer/v1_0/components-chromium/paper-progress/paper-progress.html
diff --git a/third_party/polymer/v1_0/components-chromium/paper-progress/paper-progress.html b/third_party/polymer/v1_0/components-chromium/paper-progress/paper-progress.html
index 5a2a3a8a4d12e8d4d6e289ade7a3d7ed25334311..4a5abdcade6cbb79145d6ae59df84f051aaf614c 100644
--- a/third_party/polymer/v1_0/components-chromium/paper-progress/paper-progress.html
+++ b/third_party/polymer/v1_0/components-chromium/paper-progress/paper-progress.html
@@ -124,28 +124,22 @@ Custom property                                  | Description
 
       :host(.transiting) #primaryProgress,
       :host(.transiting) #secondaryProgress {
-        -webkit-transition-property: -webkit-transform;
         transition-property: transform;
 
         /* Duration */
-        -webkit-transition-duration: var(--paper-progress-transition-duration, 0.08s);
         transition-duration: var(--paper-progress-transition-duration, 0.08s);
 
         /* Timing function */
-        -webkit-transition-timing-function: var(--paper-progress-transition-timing-function, ease);
         transition-timing-function: var(--paper-progress-transition-timing-function, ease);
 
         /* Delay */
-        -webkit-transition-delay: var(--paper-progress-transition-delay, 0s);
         transition-delay: var(--paper-progress-transition-delay, 0s);
       }
 
       #primaryProgress,
       #secondaryProgress {
         @apply(--layout-fit);
-        -webkit-transform-origin: left center;
         transform-origin: left center;
-        -webkit-transform: scaleX(0);
         transform: scaleX(0);
         will-change: transform;
       }
@@ -167,52 +161,18 @@ Custom property                                  | Description
       }
 
       :host(:not([disabled])) #primaryProgress.indeterminate {
-        -webkit-transform-origin: right center;
         transform-origin: right center;
-        -webkit-animation: indeterminate-bar var(--paper-progress-indeterminate-cycle-duration, 2s) linear infinite;
         animation: indeterminate-bar var(--paper-progress-indeterminate-cycle-duration, 2s) linear infinite;
       }
 
       :host(:not([disabled])) #primaryProgress.indeterminate::after {
         content: "";
-        -webkit-transform-origin: center center;
         transform-origin: center center;
 
-        -webkit-animation: indeterminate-splitter var(--paper-progress-indeterminate-cycle-duration, 2s) linear infinite;
         animation: indeterminate-splitter var(--paper-progress-indeterminate-cycle-duration, 2s) linear infinite;
       }
 
-      @-webkit-keyframes indeterminate-bar {
-        0% {
-          -webkit-transform: scaleX(1) translateX(-100%);
-        }
-        50% {
-          -webkit-transform: scaleX(1) translateX(0%);
-        }
-        75% {
-          -webkit-transform: scaleX(1) translateX(0%);
-          -webkit-animation-timing-function: cubic-bezier(.28,.62,.37,.91);
-        }
-        100% {
-          -webkit-transform: scaleX(0) translateX(0%);
-        }
-      }
 
-      @-webkit-keyframes indeterminate-splitter {
-        0% {
-          -webkit-transform: scaleX(.75) translateX(-125%);
-        }
-        30% {
-          -webkit-transform: scaleX(.75) translateX(-125%);
-          -webkit-animation-timing-function: cubic-bezier(.42,0,.6,.8);
-        }
-        90% {
-          -webkit-transform: scaleX(.75) translateX(125%);
-        }
-        100% {
-          -webkit-transform: scaleX(.75) translateX(125%);
-        }
-      }
 
       @keyframes indeterminate-bar {
         0% {