Make earcon ids strings instead of numbers.

chrome/browser/resources/chromeos/chromevox/common/description_util.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 utility class for building NavDescriptions from the dom.
  */
 
 
 goog.provide('cvox.DescriptionUtil');
@@ skipping 451 matching lines @@
   var traverse = cvox.TraverseMath.getInstance();
   speechEngine.parameterize(cvox.MathmlStore.getInstance());
   traverse.initialize(node);
   var ret = speechEngine.evaluateNode(traverse.activeNode);
   if (ret == []) {
     return [new cvox.NavDescription({'text': 'empty math'})];
   }
   if (cvox.ChromeVox.verbosity == cvox.VERBOSITY_VERBOSE) {
     ret[ret.length - 1].annotation = 'math';
   }
-  ret[0].pushEarcon(cvox.AbstractEarcons.SPECIAL_CONTENT);
+  ret[0].pushEarcon(cvox.Earcon.SPECIAL_CONTENT);
   return ret;
 };