Remove all calls to domAutomationController.setAutomationId.

chrome/browser/resources/chromeos/neterror.js

 // Copyright 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.
 
 function toggleHelpBox() {
   var helpBoxOuter = $('details');
   helpBoxOuter.classList.toggle('hidden');
   var detailsButton = $('details-button');
   if (helpBoxOuter.classList.contains('hidden')) {
     detailsButton.innerText = detailsButton.detailsText;
   } else {
     detailsButton.innerText = detailsButton.hideDetailsText;
   }
 }
 
 function diagnoseErrors() {
-  window.domAutomationController.setAutomationId(1);
   window.domAutomationController.send('open_connectivity_diagnostics');
 }
 
 // Subframes use a different layout but the same html file.  This is to make it
 // easier to support platforms that load the error page via different
 // mechanisms (Currently just iOS).
 if (window.top.location != window.location)
   document.documentElement.setAttribute('subframe', '');
 
 // Re-renders the error page using |strings| as the dictionary of values.
@@ skipping 18 matching lines @@
   if (oldClass !== undefined)
     classList.remove(oldClass);
 
   classList['last_icon_class'] = newClass;
 
   if (newClass == 'icon-offline') {
     document.body.classList.add('offline');
     new Runner('.interstitial-wrapper');
   }
 }