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

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.ChromeVoxEditableElement');
 goog.provide('cvox.ChromeVoxEditableHTMLInput');
 goog.provide('cvox.ChromeVoxEditableTextArea');
 goog.provide('cvox.TextHandlerInterface');
 
@@ skipping 542 matching lines @@
 
 
 /** @override */
 cvox.ChromeVoxEditableContentEditable.prototype.changed =
     function(evt) {
   if (!evt.triggeredByUser) {
     return;
   }
   // Take over here if we can't describe a change; assume it's a blank line.
   if (!this.shouldDescribeChange(evt)) {
-    this.speak(cvox.ChromeVox.msgs.getMsg('text_box_blank'), true);
+    this.speak(Msgs.getMsg('text_box_blank'), true);
     if (this.brailleHandler_) {
       this.brailleHandler_.changed('' /*line*/, 0 /*start*/, 0 /*end*/,
                                    true /*multiline*/, null /*element*/,
                                    evt.start /*lineStart*/);
     }
   } else {
     goog.base(this, 'changed', evt);
   }
 };
 
@@ skipping 66 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;
 };