Use an enum for ChromeVox queue mode.

chrome/browser/resources/chromeos/chromevox/walkers/table_walker.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 A class for walking tables.
  * NOTE: This class has a very different interface than the other walkers.
  * This means it does not lend itself easily to e.g. decorators.
  * TODO (stoarca): This might be able to be fixed by breaking it up into
  * separate walkers for cell, row and column.
@@ skipping 186 matching lines @@
   }, this));
 };
 
 /**
  * @param {!cvox.CursorSelection} sel The current selection.
  * @return {cvox.CursorSelection} The resulting selection.
  * @expose
  */
 cvox.TableWalker.prototype.announceHeaders = function(sel) {
   cvox.ChromeVox.tts.speak(this.getHeaderText_(sel),
-                           cvox.AbstractTts.QUEUE_MODE_FLUSH,
+                           cvox.QueueMode.FLUSH,
                            cvox.AbstractTts.PERSONALITY_ANNOTATION);
   return sel;
 };
 
 /**
  * @param {!cvox.CursorSelection} sel The current selection.
  * @return {cvox.CursorSelection} The resulting selection.
  * @expose
  */
 cvox.TableWalker.prototype.speakTableLocation = function(sel) {
   cvox.ChromeVox.navigationManager.speakDescriptionArray(
       this.getLocationDescription_(sel),
-      cvox.AbstractTts.QUEUE_MODE_FLUSH,
+      cvox.QueueMode.FLUSH,
       null);
   return sel;
 };
 
 
 /**
  * @param {!cvox.CursorSelection} sel The current selection.
  * @return {cvox.CursorSelection} The resulting selection.
  * @expose
  */
@@ skipping 181 matching lines @@
  * @return {Array.<number>} The position [x, y] of the selection.
  * @private
  */
 cvox.TableWalker.prototype.syncPosition_ = function(sel) {
   var tableNode = this.getTableNode_(sel);
   this.tt.initialize(tableNode);
   // we need to align the TraverseTable with our sel because our walker
   // uses parts of it (for example isSpanned relies on being at a specific cell)
   return this.tt.findNearestCursor(sel.end.node);
 };