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

chrome/browser/resources/file_manager/css/file_manager.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. */
 
 html {
   height: 100%;
 }
 
 html.col-resize * {
   cursor: col-resize !important;
@@ skipping 348 matching lines @@
 #dir-breadcrumbs {
   -webkit-margin-end: 5px;
   -webkit-margin-start: 10px;
 }
 
 #search-breadcrumbs {
   -webkit-margin-end: 5px;
   -webkit-margin-start: 5px;
 }
 
-.breadcrumbs > [collapsed]:before {
+.breadcrumbs > [collapsed]::before {
   content: '...';
 }
 
 .breadcrumbs > [collapsed] {
   width: 1em;
 }
 
 /* A single directory name in the list of path breadcrumbs. */
 .breadcrumb-path {
   color: rgb(38, 86, 146);
@@ skipping 114 matching lines @@
     url('../images/files/ui/search_clear_hover.png') 1x,
     url('../images/files/ui/2x/search_clear_hover.png') 2x);
 }
 
 #search-box::-webkit-search-cancel-button:active {
   background-image: -webkit-image-set(
     url('../images/files/ui/search_clear_pressed.png') 1x,
     url('../images/files/ui/2x/search_clear_pressed.png') 2x);
 }
 
-button#detail-view:before {
+button#detail-view::before {
   background-image: -webkit-image-set(
     url('../images/files/ui/view_list_black.png') 1x,
     url('../images/files/ui/2x/view_list_black.png') 2x);
 }
 
-button#thumbnail-view:before {
+button#thumbnail-view::before {
   background-image: -webkit-image-set(
     url('../images/files/ui/view_thumbs_black.png') 1x,
     url('../images/files/ui/2x/view_thumbs_black.png') 2x);
 }
 
-button#detail-view:before,
-button#thumbnail-view:before {
+button#detail-view::before,
+button#thumbnail-view::before {
   background-position: center;
   background-repeat: no-repeat;
   bottom: 0;
   content: '';
   left: 0;
   opacity: 0.5;
   position: absolute;
   right: 0;
   top: 0;
 }
 
-button#detail-view[disabled]:before,
-button#thumbnail-view[disabled]:before {
+button#detail-view[disabled]::before,
+button#thumbnail-view[disabled]::before {
   opacity: 0.75;
 }
 
-button#detail-view:hover:before,
-button#thumbnail-view:hover:before {
+button#detail-view:hover::before,
+button#thumbnail-view:hover::before {
   opacity: 1;
 }
 
 
 /* When detail-view is not disabled (thus thumbnail view is disabled), push
    it up a little, to make it's right glowing border visible while focused.*/
 button#detail-view:not([disabled]) {
   z-index: 2;
 }
 
@@ skipping 858 matching lines @@
 body[type='open-file'] [visibleif]:not([visibleif~='open-file']),
 body[type='open-multi-file'] [visibleif]:not([visibleif~='open-multi-file']),
 body[type='full-page'] [visibleif]:not([visibleif~='full-page']) {
   display: none;
 }
 
 body:not([ctrl-pressing]) [required_attr='ctrl-pressing'] {
   display: none;
 }
 
-#gdata-settings:before {
+#gdata-settings::before {
   background-image: url('../images/files/ui/settings.svg');
   background-position: 20px center;
   background-repeat: no-repeat;
   bottom: 0;
   content: '';
   left: 0;
   opacity: 0.75;
   position: absolute;
   right: 0;
   top: 0;
 }
 
-#gdata-settings:hover:before {
+#gdata-settings:hover::before {
   opacity: 1;
 }
 
 
 #gdata-settings {
   overflow: hidden;
   text-align: left;
   width: 54px;
 }
 
@@ skipping 46 matching lines @@
   outline: 1px solid rgba(255, 255, 255, 0.5);
   padding: 0 10px;
   pointer-events: none;
   position: absolute;
   text-align: center;
   top: 5px;
   white-space: nowrap;
   z-index: 15;
 }
 
-.tooltip:after,
-.tooltip:before {
+.tooltip::after,
+.tooltip::before {
   border-left: 5px solid transparent;
   border-right: 5px solid transparent;
   border-top: transparent;
   content: '';
   display: block;
   margin-left: -5px;
   position: absolute;
   right: 24px;
   top: -5px;
 }
 
-.tooltip:after {
+.tooltip::after {
   border-bottom: 5px solid #2d2d2d;
 }
 
-.tooltip:before {
+.tooltip::before {
   border-bottom: 5px solid rgba(255, 255, 255, 0.5);
 }
 
 /* Show with delay, disappear instantly */
 @-webkit-keyframes tooltip-show {
   0% { opacity: 0; }
   90% { opacity: 0; }
   100% { opacity: 1; }
 }
 
@@ skipping 76 matching lines @@
 
 #default-action-dialog {
   min-width: 300px;
   width: auto;
 }
 
 .gdrive-welcome-wrapper {
   /* gdrive_welcome.css will override it once loaded. */
   display: none;
 }