Fix material Help page redirect, again

chrome/test/data/webui/settings/help_page_browsertest.js

+// Copyright 2016 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 Material Help page tests. */
+
+GEN_INCLUDE(['settings_page_browsertest.js']);
+GEN('#include "base/command_line.h"');
+
+/**
+ * @constructor
+ * @extends {SettingsPageBrowserTest}
+*/
+function SettingsHelpPageBrowserTest() {}
+
+SettingsHelpPageBrowserTest.prototype = {
+  __proto__: SettingsPageBrowserTest.prototype,
+
+  /** @override */
+  browsePreload: 'chrome://help/',
+
+  commandLineSwitches: [{switchName: 'enable-features',
+                         switchValue: 'MaterialDesignSettings'}],
+
+  /** @override */
+  extraLibraries: PolymerTest.getLibraries(ROOT_PATH),
+};
+
+TEST_F('SettingsHelpPageBrowserTest', 'Load', function() {
+  // Assign |self| to |this| instead of binding since 'this' in suite()
+  // and test() will be a Mocha 'Suite' or 'Test' instance.
+  var self = this;
+
+  // Register mocha tests.
+  suite('Help page', function() {
+    test('about section', function() {
+      var page = self.getPage('about');
+      expectTrue(!!self.getSection(page, 'about'));
+    });
+  });
+
+  // Run all registered tests.
+  mocha.run();
+});