Use an enum for ChromeVox queue mode.

chrome/browser/resources/chromeos/chromevox/common/editable_text.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.
 
 goog.provide('cvox.ChromeVoxEditableContentEditable');
 goog.provide('cvox.ChromeVoxEditableHTMLInput');
 goog.provide('cvox.ChromeVoxEditableTextArea');
 goog.provide('cvox.ChromeVoxEditableTextBase');
 goog.provide('cvox.TextChangeEvent');
 goog.provide('cvox.TextHandlerInterface');
@@ skipping 326 matching lines @@
  * user action.
  * @param {Object=} opt_personality Personality used to speak text.
  */
 cvox.ChromeVoxEditableTextBase.prototype.speak =
     function(str, opt_triggeredByUser, opt_personality) {
   // If there is a node associated with the editable text object,
   // make sure that node has focus before speaking it.
   if (this.node && (document.activeElement != this.node)) {
     return;
   }
-  var queueMode = cvox.AbstractTts.QUEUE_MODE_QUEUE;
+  var queueMode = cvox.QueueMode.QUEUE;
   if (opt_triggeredByUser === true) {
-    queueMode = cvox.AbstractTts.QUEUE_MODE_FLUSH;
+    queueMode = cvox.QueueMode.FLUSH;
   }
   this.tts.speak(str, queueMode, opt_personality || {});
 };
 
 
 /**
  * Update the state of the text and selection and describe any changes as
  * appropriate.
  *
  * @param {cvox.TextChangeEvent} evt The text change event.
@@ skipping 962 matching lines @@
     // but there is still content after the new line (like the example
     // above after "Title"). In these cases, we "pretend" we're the
     // last character so we speak "blank".
     return false;
   }
 
   // Otherwise, we should never speak "blank" no matter what (even if
   // we're at the end of a content editable).
   return true;
 };