Revert of Disable many tests with flaky accessibility audits.

chrome/browser/ui/webui/options/browser_options_browsertest.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.
 
 GEN_INCLUDE(['options_browsertest_base.js']);
 
 /**
  * TestFixture for browser options WebUI testing.
  * @extends {testing.Test}
  * @constructor
@@ skipping 100 matching lines @@
 function AdvancedSettingsWebUITest() {}
 
 AdvancedSettingsWebUITest.prototype = {
   __proto__: OptionsBrowsertestBase.prototype,
 
   /** @override */
   browsePreload: 'chrome://settings-frame/autofill',
 };
 
 // TODO(crbug.com/617066) Flakes on Win.
-// TODO(crbug.com/657514) Flakes on linux and chromeos too.
-GEN('#if defined(OS_WIN) || defined(OS_LINUX) || defined(OS_CHROMEOS)');
+GEN('#if defined(OS_WIN)');
 GEN('#define MAYBE_testAdvancedSettingsShown ' +
     'DISABLED_testAdvancedSettingsShown');
 GEN('#else');
 GEN('#define MAYBE_testAdvancedSettingsShown testAdvancedSettingsShown');
 GEN('#endif');
 TEST_F('AdvancedSettingsWebUITest', 'MAYBE_testAdvancedSettingsShown',
     function() {
   assertEquals(this.browsePreload, document.location.href);
   expectFalse($('advanced-settings').hidden);
 });