Language settings: Fix Restart and Remove buttons shown at wrong times

chrome/test/data/webui/settings/languages_tests.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-languages', function() {
   /**
    * Data-binds two Polymer properties using the property-changed events and
    * set/notifyPath API. Useful for testing components which would normally be
    * used together.
    * @param {!HTMLElement} el1
@@ skipping 72 matching lines @@
 
     setup(function() {
       var settingsPrefs = document.createElement('settings-prefs');
       var settingsPrivate = new settings.FakeSettingsPrivate(getFakePrefs());
       settingsPrefs.initialize(settingsPrivate);
 
       languageSettingsPrivate = new settings.FakeLanguageSettingsPrivate();
       languageSettingsPrivate.setSettingsPrefs(settingsPrefs);
       settings.languageSettingsPrivateApiForTest = languageSettingsPrivate;
 
+      var getProspectiveUILanguageCalled = false;
+      registerMessageCallback('getProspectiveUILanguage', null,
+          function(callbackId) {
+            assertFalse(getProspectiveUILanguageCalled);
+            getProspectiveUILanguageCalled = true;
+            cr.webUIResponse(callbackId, true, 'en-US');
+          });
+
       languageHelper = document.createElement('settings-languages');
 
       // Prefs would normally be data-bound to settings-languages.
       fakeDataBind(settingsPrefs, languageHelper, 'prefs');
 
-      return languageHelper.whenReady();
+      return languageHelper.whenReady().then(function() {
+        assertEquals(
+            cr.isChromeOS || cr.isWindows, getProspectiveUILanguageCalled);
+      });
     });
 
     test('languages model', function() {
       for (var i = 0; i < languageSettingsPrivate.languages.length;
            i++) {
         assertEquals(languageSettingsPrivate.languages[i].code,
                      languageHelper.languages.supported[i].code);
       }
       assertLanguageOrder(['en-US', 'sw']);
       assertEquals('en', languageHelper.languages.translateTarget);
@@ skipping 75 matching lines @@
         // The US Swahili keyboard should still be enabled, because it supports
         // English which is still enabled.
         assertTrue(languageHelper.languages.inputMethods.enabled.some(
               function(inputMethod) {
                 return inputMethod.id == swUS;
               }));
       });
     }
   });
 });