MD Settings: actually fix sync Learn More click issues

chrome/test/data/webui/settings/people_page_sync_page_test.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.
 
 cr.define('settings_people_page_sync_page', function() {
   /**
    * @constructor
    * @implements {settings.SyncBrowserProxy}
    * @extends {settings.TestBrowserProxy}
    */
@@ skipping 269 matching lines @@
         assertTrue(!!syncPage.$$('#create-password-box'));
         var saveNewPassphrase = syncPage.$$('#saveNewPassphrase');
         assertTrue(!!saveNewPassphrase);
 
         // Test that a sync prefs update does not reset the selection.
         cr.webUIListenerCallback('sync-prefs-changed', getSyncAllPrefs());
         Polymer.dom.flush();
         assertTrue(encryptWithPassphrase.checked);
       });
 
+      test('ClickingLinkDoesNotChangeRadioValue', function() {
+        assertFalse(encryptWithPassphrase.disabled);
+        assertFalse(encryptWithPassphrase.checked);
+
+        // Make sure the checkbox is enabled and checked.

[tommycli, 2016/12/15 16:08:33]

nit: it's actually a radio box

[Dan Beam, 2016/12/16 01:24:40]

Done.

+        var link = encryptWithPassphrase.querySelector('a[href]');
+        assertTrue(!!link);
+
+        // Suppress opening a new tab, since then the test will continue running
+        // on a background tab (which has throttled timers) and will timeout.
+        link.target = '';
+        link.href = '#';
+
+        MockInteractions.tap(link);
+
+        assertFalse(encryptWithPassphrase.checked);
+      });
+
       test('SaveButtonDisabledWhenPassphraseOrConfirmationEmpty', function() {
         MockInteractions.tap(encryptWithPassphrase);
         Polymer.dom.flush();
 
         assertTrue(!!syncPage.$$('#create-password-box'));
         var saveNewPassphrase = syncPage.$$('#saveNewPassphrase');
         var passphraseInput = syncPage.$$('#passphraseInput');
         var passphraseConfirmationInput =
             syncPage.$$('#passphraseConfirmationInput');
 
@@ skipping 169 matching lines @@
       });
     });
   }
 
   return {
     registerTests: function() {
       registerAdvancedSyncSettingsTests();
     },
   };
 });