Enable the accessibility audit for chrome://net-internals

chrome/browser/resources/net_internals/top_bar_view.html

 <!--
 Copyright (c) 2013 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.
 -->
 
 <!-- Status bar at top of screen -->
 
 <style>
 
@@ skipping 30 matching lines @@
   top: 1px;
 }
 
 #top-bar-view-tab-selecter:focus {
   box-shadow: 0 0 3px 4px rgba(255, 238, 0, 0.50);
 }
 
 #top-bar-view {
   -webkit-align-items: center;
   border-bottom: 1px solid gray;
-  color: #eee;
+  color: #fff;
   display: -webkit-flex;
   padding: 2px 2px 4px 7px;
 }
 </style>
 
 <div id=top-bar-view>
   <span class=top-bar-view-arrow>
-    <select id=top-bar-view-tab-selecter></select>
+    <select aria-label="Tab selector" id=top-bar-view-tab-selecter></select>
   </span>
   <div style="-webkit-flex-grow: 1">
     <include src="status_view.html"/>
   </div>
 </div>