MD Settings: Eliminate SettingsSubpageBrowsertest.

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

 // Copyright 2015 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 Runs Polymer OnStartup Settings tests. */
 
 GEN_INCLUDE(['settings_page_browsertest.js']);
 
 /**
   * Radio button enum values for restore on startup.
@@ skipping 18 matching lines @@
   /** @return {Element} */
   getPageElement: function(selector) {
     var section = this.getSection(this.basicPage, 'onStartup');
     assertTrue(!!section);
     var module = section.querySelector('settings-on-startup-page');
     assertTrue(!!module);
     var result = module.$$(selector);
     assertTrue(!!result);
     return result;
   },
-
-  /** @override */
-  preLoad: function() {
-    SettingsPageBrowserTest.prototype.preLoad.call(this);
-    settingsHidePagesByDefaultForTest = true;
-  },
 };
 
 TEST_F('OnStartupSettingsBrowserTest', 'uiTests', function() {
   /**
    * The prefs API that will get a fake implementation.
    * @type {!SettingsPrivate}
    */
   var settingsPrefs;
   var self = this;
 
@@ skipping 26 matching lines @@
     });
 
     test('open-specific', function() {
       settingsPrefs.set('prefs.session.restore_on_startup.value',
           RestoreOnStartupEnum.OPEN_SPECIFIC);
       assertEquals('Open a specific page or set of pages', restoreOnStartup());
     });
   });
   mocha.run();
 });