Disabled flaky UserManagerBrowserTest.UserManagerTest

chrome/test/data/webui/md_user_manager/user_manager_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 Tests for the Material Design user manager page. */
 
 /** @const {string} Path to root from chrome/test/data/webui/md_user_manager/ */
 var ROOT_PATH = '../../../../../';
 
 // Polymer BrowserTest fixture.
@@ skipping 19 matching lines @@
     'create_profile_tests.js',
     'import_supervised_user_tests.js',
     'test_profile_browser_proxy.js',
     'user_manager_pages_tests.js',
   ]),
 
   /** @override */
   runAccessibilityChecks: false,
 };
 
-TEST_F('UserManagerBrowserTest', 'UserManagerTest', function() {
+// Flaky timeout failures on all platforms; see https://crbug.com/613191.
+TEST_F('UserManagerBrowserTest', 'DISABLED_UserManagerTest', function() {
   // Disable 'pod-row' so it won't handle click events after we clear the body.
   $('pod-row').disabled = true;
 
   user_manager.control_bar_tests.registerTests();
   user_manager.create_profile_tests.registerTests();
   user_manager.import_supervised_user_tests.registerTests();
   user_manager.user_manager_pages_tests.registerTests();
   mocha.run();
 });