Add script to remove prefixed CSS from third_party/polymer.

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

Index: third_party/polymer/v1_0/components-chromium/paper-slider/paper-slider.html
diff --git a/third_party/polymer/v1_0/components-chromium/paper-slider/paper-slider.html b/third_party/polymer/v1_0/components-chromium/paper-slider/paper-slider.html
index a53a0bbb4b53827c8f6e26acbbd98a26c3ba7a72..2f862c15aeedeb35a357ff41f3267d27e50b5511 100644
--- a/third_party/polymer/v1_0/components-chromium/paper-slider/paper-slider.html
+++ b/third_party/polymer/v1_0/components-chromium/paper-slider/paper-slider.html
@@ -72,9 +72,6 @@ Custom property | Description | Default
         @apply(--layout-center);
         width: 200px;
         cursor: default;
-        -webkit-user-select: none;
-        -moz-user-select: none;
-        -ms-user-select: none;
         user-select: none;
         -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
         --paper-progress-active-color: var(--paper-slider-active-color, --google-blue-700);
@@ -183,7 +180,6 @@ Custom property | Description | Default
       }
 
       .snaps > .slider-knob.dragging {
-        transition: -webkit-transform 0.08s ease;
         transition: transform 0.08s ease;
       }
 
@@ -195,17 +191,14 @@ Custom property | Description | Default
         border: 2px solid var(--paper-slider-knob-color, --google-blue-700);
         border-radius: 50%;
 
-        -moz-box-sizing: border-box;
         box-sizing: border-box;
 
-        transition-property: -webkit-transform, background-color, border;
         transition-property: transform, background-color, border;
         transition-duration: 0.18s;
         transition-timing-function: ease;
       }
 
       .expand:not(.pin) > .slider-knob > .slider-knob-inner {
-        -webkit-transform: scale(1.5);
         transform: scale(1.5);
       }
 
@@ -228,13 +221,11 @@ Custom property | Description | Default
         height: 26px;
         border-radius: 50% 50% 50% 0;
 
-        -webkit-transform: rotate(-45deg) scale(0) translate(0);
         transform: rotate(-45deg) scale(0) translate(0);
       }
 
       .slider-knob-inner::before,
       .slider-knob-inner::after {
-        transition: -webkit-transform .18s ease, background-color .18s ease;
         transition: transform .18s ease, background-color .18s ease;
       }
 
@@ -243,7 +234,6 @@ Custom property | Description | Default
       }
 
       .pin.expand > .slider-knob > .slider-knob-inner::before {
-        -webkit-transform: rotate(-45deg) scale(1) translate(17px, -17px);
         transform: rotate(-45deg) scale(1) translate(17px, -17px);
       }
 
@@ -259,12 +249,10 @@ Custom property | Description | Default
         color: var(--paper-slider-font-color, #fff);
         font-size: 10px;
 
-        -webkit-transform: scale(0) translate(0);
         transform: scale(0) translate(0);
       }
 
       .pin.expand > .slider-knob > .slider-knob-inner::after {
-        -webkit-transform: scale(1) translate(0, -17px);
         transform: scale(1) translate(0, -17px);
       }
 
@@ -286,7 +274,6 @@ Custom property | Description | Default
       .disabled > .slider-knob > .slider-knob-inner {
         background-color: var(--paper-slider-disabled-knob-color, --paper-grey-400);
         border: 2px solid var(--paper-slider-disabled-knob-color, --paper-grey-400);
-        -webkit-transform: scale3d(0.75, 0.75, 1);
         transform: scale3d(0.75, 0.75, 1);
       }