Split out non-auto-generatable externs from auto generated ones.

chrome/browser/resources/chromeos/chromevox/cvox2/background/find_handler.js

 // Copyright 2016 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 Handles output for Chrome's built-in find.
  */
 goog.provide('FindHandler');
 
 goog.require('Output');
 
 /**
  * Responds to mode changes.
  * @param {ChromeVoxMode} newMode
  * @param {?ChromeVoxMode} oldMode Can be null at startup when no range was
  *  previously set.
  */
 FindHandler.onModeChanged = function(newMode, oldMode) {
   if (newMode == ChromeVoxMode.FORCE_NEXT)
     FindHandler.init_();
   else
     FindHandler.uninit_();
 };
 
 /**
  * Initializes this module.
  * @private
  */
 FindHandler.init_ = function() {
   chrome.automation.addTreeChangeObserver(
-      'textMarkerChanges', FindHandler.onTextMatch_);
+      chrome.automation.TreeChangeObserverFilter.TEXT_MARKER_CHANGES,
+      FindHandler.onTextMatch_);
 };
 
 /**
  * Uninitializes this module.
  * @private
  */
 FindHandler.uninit_ = function() {
   chrome.automation.removeTreeChangeObserver(FindHandler.onTextMatch_);
 };
 
 /**
  * @param {Object} evt
  * @private
  */
 FindHandler.onTextMatch_ = function(evt) {
   if (!evt.target.markerTypes.some(function(markerType) {
           return markerType & 4 /* Text match */;
       }))
     return;
 
   var range = cursors.Range.fromNode(evt.target);
   ChromeVoxState.instance.setCurrentRange(range);
   new Output()
       .withRichSpeechAndBraille(range, null, Output.EventType.NAVIGATE)
       .go();
 };