Fix ChromeVox next tests to fail instead of timing out where applicable.

chrome/browser/resources/chromeos/chromevox/braille/liblouis.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 JavaScript shim for the liblouis Native Client wrapper.
  */
 
 goog.provide('cvox.LibLouis');
 
@@ skipping 217 matching lines @@
  * @param {string} text Text to be translated.
  * @param {function(ArrayBuffer, Array<number>, Array<number>)} callback
  *     Callback for result.  Takes 3 parameters: the resulting cells,
  *     mapping from text to braille positions and mapping from braille to
  *     text positions.  If translation fails for any reason, all parameters are
  *     {@code null}.
  */
 cvox.LibLouis.Translator.prototype.translate = function(text, callback) {
   if (!this.instance_.isAttached()) {
     callback(null /*cells*/, null /*textToBraille*/, null /*brailleToText*/);
+    return;
   }
   var message = { 'table_names': this.tableNames_, 'text': text };
   this.instance_.rpc_('Translate', message, function(reply) {
     var cells = null;
     var textToBraille = null;
     var brailleToText = null;
     if (reply['success'] && goog.isString(reply['cells'])) {
       cells = cvox.LibLouis.Translator.decodeHexString_(reply['cells']);
       if (goog.isDef(reply['text_to_braille'])) {
         textToBraille = reply['text_to_braille'];
@@ skipping 13 matching lines @@
 
 /**
  * Translates braille cells into text.
  * @param {!ArrayBuffer} cells Cells to be translated.
  * @param {function(?string)} callback Callback for result.
  */
 cvox.LibLouis.Translator.prototype.backTranslate =
     function(cells, callback) {
   if (!this.instance_.isAttached()) {
     callback(null /*text*/);
+    return;
   }
   if (cells.byteLength == 0) {
     // liblouis doesn't handle empty input, so handle that trivially
     // here.
     callback('');
     return;
   }
   var message = {
     'table_names': this.tableNames_,
     'cells': cvox.LibLouis.Translator.encodeHexString_(cells)
@@ skipping 35 matching lines @@
  */
 cvox.LibLouis.Translator.encodeHexString_ = function(arrayBuffer) {
   var array = new Uint8Array(arrayBuffer);
   var hex = '';
   for (var i = 0; i < array.length; i++) {
     var b = array[i];
     hex += (b < 0x10 ? '0' : '') + b.toString(16);
   }
   return hex;
 };