Reland: Make ChromeVox Next a setting in options page

chrome/browser/resources/chromeos/chromevox/chromevox/background/prefs.js

 // Copyright 2014 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.
 
 /**
  * @fileoverview Common page for reading and writing preferences from
  * the background context (background page or options page).
  *
  */
 
@@ skipping 61 matching lines @@
   'outputContextFirst': false,
   'position': '{}',
   'siteSpecificScriptBase':
       'https://ssl.gstatic.com/accessibility/javascript/ext/',
   'siteSpecificScriptLoader':
       'https://ssl.gstatic.com/accessibility/javascript/ext/loader.js',
   'sticky': false,
   'typingEcho': 0,
   'useIBeamCursor': cvox.ChromeVox.isMac,
   'useVerboseMode': true,
-  'siteSpecificEnhancements': true
+  'siteSpecificEnhancements': true,
+  'useNext': false
 };
 
 
 /**
  * Merge the default values of all known prefs with what's found in
  * localStorage.
  * @param {boolean} pullFromLocalStorage or not to pull prefs from local
  * storage. True if we want to respect changes the user has already made
  * to prefs, false if we want to overwrite them. Set false if we've made
  * changes to keyboard shortcuts and need to make sure they aren't
@@ skipping 131 matching lines @@
  * @return {boolean} True if the key was bound to the command.
  */
 cvox.ChromeVoxPrefs.prototype.setKey = function(command, newKey) {
   if (this.keyMap_.rebind(command, newKey)) {
     this.keyMap_.toLocalStorage();
     this.sendPrefsToAllTabs(false, true);
     return true;
   }
   return false;
 };