Add script to remove prefixed CSS from third_party/polymer.

third_party/polymer/v1_0/components-chromium/paper-input/paper-input-container.html

Index: third_party/polymer/v1_0/components-chromium/paper-input/paper-input-container.html
diff --git a/third_party/polymer/v1_0/components-chromium/paper-input/paper-input-container.html b/third_party/polymer/v1_0/components-chromium/paper-input/paper-input-container.html
index a7deb38f995f1fcac4c19685526a898433b915ec..e27603f536e68966cbf5f0d9322b53f0b4548d4e 100644
--- a/third_party/polymer/v1_0/components-chromium/paper-input/paper-input-container.html
+++ b/third_party/polymer/v1_0/components-chromium/paper-input/paper-input-container.html
@@ -125,18 +125,14 @@ This element is `display:block` by default, but you can set the `inline` attribu
 
         background: var(--paper-input-container-focus-color, --default-primary-color);
         height: 2px;
-        -webkit-transform-origin: center center;
         transform-origin: center center;
-        -webkit-transform: scale3d(0,1,1);
         transform: scale3d(0,1,1);
 
         @apply(--paper-input-container-underline-focus);
       }
 
       .underline.is-highlighted .focused-line {
-        -webkit-transform: none;
         transform: none;
-        -webkit-transition: -webkit-transform 0.25s;
         transition: transform 0.25s;
 
         @apply(--paper-transition-easing);
@@ -144,9 +140,7 @@ This element is `display:block` by default, but you can set the `inline` attribu
 
       .underline.is-invalid .focused-line {
         background: var(--paper-input-container-invalid-color, --google-red-500);
-        -webkit-transform: none;
         transform: none;
-        -webkit-transition: -webkit-transform 0.25s;
         transition: transform 0.25s;
 
         @apply(--paper-transition-easing);
@@ -200,11 +194,8 @@ This element is `display:block` by default, but you can set the `inline` attribu
 
       .input-content.label-is-floating ::content label,
       .input-content.label-is-floating ::content .paper-input-label {
-        -webkit-transform: translateY(-75%) scale(0.75);
         transform: translateY(-75%) scale(0.75);
-        -webkit-transition: -webkit-transform 0.25s, width 0.25s;
         transition: transform 0.25s, width 0.25s;
-        -webkit-transform-origin: left top;
         transform-origin: left top;
 
         /* Since we scale to 75/100 of the size, we actually have 100/75 of the
@@ -221,7 +212,6 @@ This element is `display:block` by default, but you can set the `inline` attribu
          * actually makes
          * it wider on the right side, not left side, as you would expect in RTL */
         width: 100%;
-        -webkit-transform-origin: right top;
         transform-origin: right top;
       }
 
@@ -255,7 +245,6 @@ This element is `display:block` by default, but you can set the `inline` attribu
         background: transparent;
         border: none;
         color: var(--paper-input-container-input-color, --primary-text-color);
-        -webkit-appearance: none;
         text-align: inherit;
 
         @apply(--paper-font-subhead);