Make earcon ids strings instead of numbers.

chrome/browser/resources/chromeos/chromevox/walkers/math_shifter.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 mathml expressions.
  */
 
 goog.provide('cvox.MathShifter');
 
@@ skipping 71 matching lines @@
 };
 
 
 /**
  * @override
  */
 cvox.MathShifter.prototype.getDescription = function(prevSel, sel) {
   var descs = cvox.SpeechRuleEngine.getInstance().evaluateNode(
       cvox.TraverseMath.getInstance().activeNode);
   if (this.bumped_ && descs.length > 0) {
-    descs[0].pushEarcon(cvox.AbstractEarcons.WRAP_EDGE);
+    descs[0].pushEarcon(cvox.Earcon.WRAP_EDGE);
   }
   return descs;
 };
 
 
 /**
  * @override
  */
 cvox.MathShifter.prototype.getBraille = function(prevSel, sel) {
   return new cvox.NavBraille({
@@ skipping 55 matching lines @@
 
 
 /**
  * The active domain of the MathShifter.
  *
  * @return {string} The name of the current Math Domain.
  */
 cvox.MathShifter.prototype.getDomainMsg = function() {
   return cvox.TraverseMath.getInstance().domain;
 };