Hotword Private API: Adds speech training functions.

chrome/test/data/extensions/api_test/hotword_private/onFinalizeSpeakerModel/test.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.
 
 chrome.test.runTests([
-  function onEnabledChangedTest() {
-    chrome.hotwordPrivate.onEnabledChanged.addListener(function () {
+  function onFinalizeSpeakerModel() {
+    chrome.hotwordPrivate.onFinalizeSpeakerModel.addListener(function () {
       chrome.test.sendMessage("notification");
       chrome.test.succeed();
     });
     chrome.test.sendMessage("ready");
   }
 ]);