Improve braille related message descriptions and clean up message handling in Chromevox.

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 60 matching lines @@
 cvox.MathShifter.prototype.sync = function(sel) {
   var attachedNode = cvox.TraverseMath.getInstance().getAttachedActiveNode();
   return attachedNode ? cvox.CursorSelection.fromNode(attachedNode) : sel;
 };
 
 
 /**
  * @override
  */
 cvox.MathShifter.prototype.getName = function() {
-  return cvox.ChromeVox.msgs.getMsg('math_shifter');
+  return Msgs.getMsg('math_shifter');
 };
 
 
 /**
  * @override
  */
 cvox.MathShifter.prototype.getDescription = function(prevSel, sel) {
   var descs = cvox.SpeechRuleEngine.getInstance().evaluateNode(
       cvox.TraverseMath.getInstance().activeNode);
   if (this.bumped_ && descs.length > 0) {
@@ skipping 66 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;
 };