Mark SettingsLanguagesPageBrowserTest.LanguagesPage flaky on Windows

chrome/test/data/webui/settings/languages_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 Suite of tests for settings-languages-page. */
 
 /** @const {string} Path to root from chrome/test/data/webui/settings/. */
 var ROOT_PATH = '../../../../../';
 
 // Polymer BrowserTest fixture.
@@ skipping 13 matching lines @@
 SettingsLanguagesPageBrowserTest.prototype = {
   __proto__: SettingsPageBrowserTest.prototype,
 
   /** @override */
   preLoad: function() {
     SettingsPageBrowserTest.prototype.preLoad.call(this);
     settingsHidePagesByDefaultForTest = true;
   },
 };
 
+// Flaky on Windows. See https://crbug.com/641400.
 // May time out on debug builders and memory bots because
 // the Settings page can take several seconds to load in a Release build
 // and several times that in a Debug build. See https://crbug.com/558434.
-GEN('#if defined(MEMORY_SANITIZER) || !defined(NDEBUG)');
+GEN('#if defined(OS_WINDOWS) || defined(MEMORY_SANITIZER) || !defined(NDEBUG)');
 GEN('#define MAYBE_LanguagesPage DISABLED_LanguagesPage');
 GEN('#else');
 GEN('#define MAYBE_LanguagesPage LanguagesPage');
 GEN('#endif');
 
 // Runs languages page tests.
 TEST_F('SettingsLanguagesPageBrowserTest', 'MAYBE_LanguagesPage', function() {
   suite('languages page', function() {
     testing.Test.disableAnimationsAndTransitions();
 
@@ skipping 229 matching lines @@
         assertTrue(!!languagesPage.$$('settings-edit-dictionary-page'));
       }
     });
   }.bind(this));
 
   // TODO(michaelpg): Test more aspects of the languages UI.
 
   // Run all registered tests.
   mocha.run();
 });