Add relaunch prompt to linux help page.

chrome/browser/ui/webui/help/help_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.
 
 /**
  * TestFixture for extension settings WebUI testing.
  * @extends {testing.Test}
  * @constructor
  */
 function HelpPageWebUITest() {}
 
 HelpPageWebUITest.prototype = {
   __proto__: testing.Test.prototype,
 
   browsePreload: 'chrome://help-frame/',
 };
 
 // Test opening extension settings has correct location.
 TEST_F('HelpPageWebUITest', 'testOpenHelpPage', function() {
   assertEquals(this.browsePreload, document.location.href);
 });
+
+GEN('#if defined(OS_LINUX) || defined(GOOGLE_CHROME_BUILD)');
+
+// Test that repeated calls to setUpdateStatus work.
+TEST_F('HelpPageWebUITest', 'testUpdateState', function() {
+  expectTrue($('update-status-container').hidden);
+
+  help.HelpPage.setUpdateStatus('disabled', '');
+  expectTrue($('relaunch').hidden);
+  expectTrue($('update-status-container').hidden);
+
+  help.HelpPage.setUpdateStatus('nearly_updated', '');
+  expectTrue(!$('relaunch').hidden);
+  expectTrue(!$('update-status-container').hidden);
+
+  help.HelpPage.setUpdateStatus('disabled', '');
+  expectTrue($('relaunch').hidden);
+  expectTrue($('update-status-container').hidden);
+});
+
+GEN('#endif');