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

chrome/browser/resources/chromeos/chromevox/cvox2/background/background.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 The entry point for all ChromeVox2 related code for the
  * background page.
  */
 
 goog.provide('Background');
@@ skipping 332 matching lines @@
     }
 
     if (pred) {
       var node = AutomationUtil.findNextNode(
           current.getBound(dir).node, dir, pred);
 
       if (node) {
         current = cursors.Range.fromNode(node);
       } else {
         if (predErrorMsg) {
-          cvox.ChromeVox.tts.speak(cvox.ChromeVox.msgs.getMsg(predErrorMsg),
+          cvox.ChromeVox.tts.speak(Msgs.getMsg(predErrorMsg),
                                    cvox.QueueMode.FLUSH);
         }
         return;
       }
     }
 
     if (current) {
       // TODO(dtseng): Figure out what it means to focus a range.
       var actionNode = current.start.node;
       if (actionNode.role == RoleType.inlineTextBox)
@@ skipping 426 matching lines @@
               node.state.protected,
               cvox.ChromeVox.tts);
     }
   }
 };
 
 /** @type {Background} */
 global.backgroundObj = new Background();
 
 });  // goog.scope