Improve TTS GetMatchingVoices algorithm

chrome/test/data/extensions/api_test/tts_engine/register_engine/test.js

 // Copyright (c) 2011 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.
 
 // TTS api test for Chrome on ChromeOS.
 // browser_tests.exe --gtest_filter="TtsApiTest.*"
 
 chrome.test.runTests([
   function testNoListeners() {
     // This call should go to native speech because we haven't registered
@@ skipping 70 matching lines @@
            if (event.type == 'end') {
              callbacks++;
            }
          }
         }, function() {
           chrome.test.assertNoLastError();
         });
     chrome.tts.speak(
         'native speech 3',
         {
+         'voiceName': 'French',
          'lang': 'fr-FR',
          'enqueue': true,
          'onEvent': function(event) {
            if (event.type == 'end') {
              callbacks++;
            }
          }
         }, function() {
           chrome.test.assertNoLastError();
         });
@@ skipping 54 matching lines @@
       chrome.test.assertEq('Alice', voices[1].voiceName);
       chrome.test.assertEq('en-US', voices[1].lang);
       chrome.test.assertEq('female', voices[1].gender);
 
       chrome.test.assertEq('Pat', voices[2].voiceName);
       chrome.test.assertEq('en-US', voices[2].lang);
       chrome.test.succeed();
     });
   }
 ]);