Update some more webui progress indicators to new throbber:

ui/webui/resources/css/spinner.css

 /* Copyright (c) 2012 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. */
 
 .inline-spinner,
 .spinner {
-  -webkit-animation: spinner-animation 1s step-end infinite;
-  background-image: url(chrome://resources/images/spinner.svg);
+  background-image: url(chrome://resources/images/throbber.svg);
   background-size: 100%;
 }
 
 .inline-spinner {
   display: inline-block;
   height: 16px;
   width: 16px;
 }
 
 .spinner {
   height: 22px;
   width: 22px;
 }
-
-@-webkit-keyframes spinner-animation {
-  0% {
-    -webkit-transform: rotate(0deg);
-  }
-  8.33% {
-    -webkit-transform: rotate(30deg);
-  }
-  16.67%  {
-    -webkit-transform: rotate(60deg);
-  }
-  25%  {
-    -webkit-transform: rotate(90deg);
-  }
-  33.33%  {
-    -webkit-transform: rotate(120deg);
-  }
-  41.67%  {
-    -webkit-transform: rotate(150deg);
-  }
-  50%  {
-    -webkit-transform: rotate(180deg);
-  }
-  58.33%  {
-    -webkit-transform: rotate(210deg);
-  }
-  66.67%  {
-    -webkit-transform: rotate(240deg);
-  }
-  75%  {
-    -webkit-transform: rotate(270deg);
-  }
-  83.33%  {
-    -webkit-transform: rotate(300deg);
-  }
-  91.67%  {
-    -webkit-transform: rotate(330deg);
-  }
-}