Drop the -webkit prefix from user-select CSS rule in ui/.

ui/webui/resources/css/table.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.col-resize * {
   cursor: col-resize !important;
 }
 
 .table[has-element-focus] > list > [lead] {
   border-color: hsl(214, 91%, 65%);
@@ skipping 45 matching lines @@
   white-space: nowrap;
 }
 
 .table-header {
   background-color: rgb(220, 220, 220);
   overflow: hidden;
   position: relative;
 }
 
 .table-header-inner {
-  -webkit-user-select: none;
   cursor: default;
   display: -webkit-box;
   position: relative;
   text-align: start;
+  user-select: none;
 }
 
 .table-header-cell {
   font-weight: normal;
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
 }
 
 .table-header-label {
@@ skipping 26 matching lines @@
 .table-header-splitter {
   -webkit-margin-start: -1px;
   background-color: black;
   cursor: col-resize;
   height: 100%;
   left: 0;
   position: absolute;
   top: 0;
   width: 5px;
 }