Revert of Make ChromeVox Next a setting in options page.

chrome/browser/resources/chromeos/chromevox/common/chrome_extension_externs.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 Definitions for the Chromium extensions API used by ChromeVox.
  *
  * @externs
  */
@@ skipping 412 matching lines @@
 chrome.automation.AutomationNode.prototype.wordStarts;
 
 
 /**
  * @type {Array<number>}
  */
 chrome.automation.AutomationNode.prototype.wordEnds;
 
 
 /**
- * @type {chrome.automation.AutomationNode}
+ * @type {!chrome.automation.AutomationNode}
  */
 chrome.automation.AutomationNode.prototype.root;
 
 
 /**
  * @type {chrome.automation.AutomationNode}
  */
 chrome.automation.AutomationNode.prototype.firstChild;
 
 
@@ skipping 169 matching lines @@
  */
 chrome.automation.focusOffset;
 
 /**
  * @type {(chrome.automation.AutomationNode|undefined)}
  */
 chrome.automation.AutomationNode.prototype.activeDescendant;
 
 /** @type {function() : !Object} */
 chrome.app.getDetails;