MD Settings: Checks the event target in the language tap event handler

chrome/test/data/webui/settings/languages_page_browsertest.js

Index: chrome/test/data/webui/settings/languages_page_browsertest.js
diff --git a/chrome/test/data/webui/settings/languages_page_browsertest.js b/chrome/test/data/webui/settings/languages_page_browsertest.js
index da3690bb9de7525303c651a1418bc47bd4e1ac41..dd36cb1fe9e1f6d1707c12d6ecfb060b657290fd 100644
--- a/chrome/test/data/webui/settings/languages_page_browsertest.js
+++ b/chrome/test/data/webui/settings/languages_page_browsertest.js
@@ -54,6 +54,7 @@ TEST_F('SettingsLanguagesPageBrowserTest', 'MAYBE_LanguagesPage', function() {
 
     var languagesSection;
     var languagesPage;
+    var languageHelper;
     suiteSetup(function() {
       advanced.set('pageVisibility.languages', true);
       Polymer.dom.flush();
@@ -63,7 +64,8 @@ TEST_F('SettingsLanguagesPageBrowserTest', 'MAYBE_LanguagesPage', function() {
       languagesPage = languagesSection.querySelector('settings-languages-page');
       assertTrue(!!languagesPage);
 
-      return LanguageHelperImpl.getInstance().whenReady();
+      languageHelper = LanguageHelperImpl.getInstance();
+      return languageHelper.whenReady();
     }.bind(this));
 
     teardown(function(done) {
@@ -84,6 +86,18 @@ TEST_F('SettingsLanguagesPageBrowserTest', 'MAYBE_LanguagesPage', function() {
       assertTrue(!!languagesPage.$$('settings-manage-languages-page'));
     });
 
+    test('Should not set UI language', function() {
+      var languagesCollapse = languagesPage.$.languagesCollapse;
+      var languageOptionsDropdownTrigger = languagesCollapse.querySelector(
+          'paper-icon-button');
+      assertTrue(!!languageOptionsDropdownTrigger);
+
+      // This shouldn't get called.
+      languageHelper.setUILanguage = assertNotReached;
+
+      MockInteractions.tap(languageOptionsDropdownTrigger);
+    });
+
     test('language detail', function() {
       var languagesCollapse = languagesPage.$.languagesCollapse;
       var languageDetailMenuItem = languagesCollapse.querySelectorAll(