Update some spinners on ChromeOS

components/chrome_apps/webstore_widget/cws_widget/cws_widget_container.css

 /* Copyright 2015 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file. */
 
 .cws-widget-container-root {
   position: relative;
 }
 
 .cws-widget-webview-container {
   border-bottom: solid 1px #bbb;
   border-top: solid 1px #bbb;
   position: relative;
 }
 
 .cws-widget-spinner-layer {
-  background: url(spinner.svg) center / 16px no-repeat;
+  background: url(chrome://resources/images/throbber.svg) center/32px no-repeat;
   background-color: rgba(255, 255, 255, 0.7);
   bottom: 0;
   left: 0;
   outline: none;
   position: absolute;
   right: 0;
   top: 0;
   transition: opacity 500ms;
   z-index: 525;
 }
@@ skipping 50 matching lines @@
     url(chrome://theme/IDR_ERROR_NETWORK_GENERIC) 1x,
     url(chrome://theme/IDR_ERROR_NETWORK_GENERIC@2x) 2x);
   background-position: center;
   background-repeat: no-repeat;
   height: 40px;
 }
 
 .cws-widget-error-dialog-text {
   text-align: center;
 }