Remove Instant v1 API.

chrome/browser/resources/options2/browser_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.
 
 cr.define('options', function() {
   var OptionsPage = options.OptionsPage;
   var ArrayDataModel = cr.ui.ArrayDataModel;
   var RepeatingButton = cr.ui.RepeatingButton;
 
   //
@@ skipping 152 matching lines @@
 
       // Search section.
       $('manage-default-search-engines').onclick = function(event) {
         OptionsPage.navigateToPage('searchEngines');
         chrome.send('coreOptionsUserMetricsAction',
                     ['Options_ManageSearchEngines']);
       };
       $('default-search-engine').addEventListener('change',
           this.setDefaultSearchEngine_);
       $('instant-enabled-control').customChangeHandler = function(event) {
-        if (this.checked) {
-          if (self.instantConfirmDialogShown_)
-            chrome.send('enableInstant');
-          else
-            OptionsPage.showPageByName('instantConfirm', false);
-        } else {
-          chrome.send('disableInstant');
+        if (this.checked && !self.instantConfirmDialogShown_) {
+          OptionsPage.showPageByName('instantConfirm', false);
+          return true;  // Stop default preference processing.
         }
-        return true;
+        return false;  // Allow default preference processing.
       };
       Preferences.getInstance().addEventListener('instant.confirm_dialog_shown',
           this.onInstantConfirmDialogShownChanged_.bind(this));
 
       // Users section.
       if (loadTimeData.valueExists('profilesInfo')) {
         $('profiles-section').hidden = false;
 
         var profilesList = $('profiles-list');
         options.browser_options.ProfileList.decorate(profilesList);
@@ skipping 1153 matching lines @@
     BrowserOptions.getLoggedInUsername = function() {
       return BrowserOptions.getInstance().username_;
     };
   }
 
   // Export
   return {
     BrowserOptions: BrowserOptions
   };
 });