[web_dev_style] Changing :pseudo-element to ::pseudo-element to match

chrome/browser/resources/options/search_page.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. */
 
 .search-hidden {
   display: none !important;
 }
 
 .search-highlighted {
   background-color: rgba(255, 240, 120, 0.9);
@@ skipping 13 matching lines @@
 /* Contains the text content of the bubble.  */
 .search-bubble-innards {
   background: -webkit-linear-gradient(rgba(255, 248, 172, 0.9),
                                       rgba(255, 243, 128, 0.9));
   border-radius: 2px;
   padding: 4px 10px;
   text-align: center;
   width: 100px;
 }
 
-/* Provides the border around the bubble (has to be behind :after). */
+/* Provides the border around the bubble (has to be behind ::after). */
 .search-bubble-innards::before {
   border: 1px solid rgb(220, 198, 72);
   border-radius: 2px;
   bottom: -1px;
   content: '';
   left: -1px;
   position: absolute;
   right: -1px;
   top: -1px;
   z-index: -2;
@@ skipping 20 matching lines @@
 
 .search-bubble-wrapper {
   position: relative;
 }
 
 /* #mainview is here to win specificity. :( */
 #mainview #searchPage.page,
 #mainview #searchBox.page {
   padding-bottom: 0;
 }