Remove chrome/ code to handle App Notifications

chrome/test/data/extensions/api_test/app_notifications/test.js

-// Copyright (c) 2012 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.
-
-var error = "This API is not accessible by 'split' mode extensions" +
-    " in incognito windows.";
-
-chrome.test.runTests([
-  function notify() {
-    chrome.experimental.app.notify(
-        {}, chrome.test.callbackFail(error));
-  },
-
-  function clearAllNotifications() {
-    chrome.experimental.app.clearAllNotifications(
-        {}, chrome.test.callbackFail(error));
-  },
-
-  function getChannel() {
-    chrome.appNotifications.getChannel(
-        {clientId: "dummy_id"},
-        chrome.test.callbackPass(function(channelId, e) {
-      chrome.test.assertEq(error, e);
-    }));
-  }
-]);