Remove instant confirmation dialog that is displayed the first time the instant checkbox is clicked.

chrome/browser/resources/options/options.js

 // 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.
 
 var AddLanguageOverlay = options.AddLanguageOverlay;
 var AlertOverlay = options.AlertOverlay;
 var AutofillEditAddressOverlay = options.AutofillEditAddressOverlay;
 var AutofillEditCreditCardOverlay = options.AutofillEditCreditCardOverlay;
 var AutofillOptions = options.AutofillOptions;
 var BrowserOptions = options.BrowserOptions;
@@ skipping 68 matching lines @@
   OptionsPage.registerOverlay(
       new ConfirmDialog(
           'doNotTrackConfirm',
           loadTimeData.getString('doNotTrackConfirmOverlayTabTitle'),
           'do-not-track-confirm-overlay',
           $('do-not-track-confirm-ok'),
           $('do-not-track-confirm-cancel'),
           $('do-not-track-enabled').pref,
           $('do-not-track-enabled').metric),
       BrowserOptions.getInstance());
-  OptionsPage.registerOverlay(
-      new ConfirmDialog(
-          'instantConfirm',
-          loadTimeData.getString('instantConfirmOverlayTabTitle'),
-          'instantConfirmOverlay',
-          $('instantConfirmOk'),
-          $('instantConfirmCancel'),
-          $('instant-enabled-control').pref,
-          $('instant-enabled-control').metric,
-          'instant.confirm_dialog_shown'),
-      BrowserOptions.getInstance());
   // 'spelling-enabled-control' element is only present on Chrome branded
   // builds.
   if ($('spelling-enabled-control')) {
     OptionsPage.registerOverlay(
         new ConfirmDialog(
             'spellingConfirm',
             loadTimeData.getString('spellingConfirmOverlayTabTitle'),
             'spelling-confirm-overlay',
             $('spelling-confirm-ok'),
             $('spelling-confirm-cancel'),
@@ skipping 172 matching lines @@
   options.OptionsPage.willClose();
 };
 
 /**
  * Listener for the |popstate| event.
  * @param {Event} e The |popstate| event.
  */
 window.onpopstate = function(e) {
   options.OptionsPage.setState(e.state);
 };