MD Settings: Restore Search engines table headers.

chrome/test/data/webui/settings/search_engines_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_search_engines_page', function() {
   /**
    * @param {boolean} canBeDefault
    * @param {boolean} canBeEdited
    * @param {boolean} canBeRemoved
    * @return {!SearchEngine}
@@ skipping 144 matching lines @@
         entry = document.createElement('settings-search-engine-entry');
         entry.set('engine', searchEngine);
         document.body.appendChild(entry);
       });
 
       teardown(function() { entry.remove(); });
 
       // Test that the <search-engine-entry> is populated according to its
       // underlying SearchEngine model.
       test('Initialization', function() {
-        var columns = entry.root.querySelectorAll('.column, #url-column');
-        assertEquals(3, columns.length);
-
-        assertEquals(searchEngine.displayName, columns[0].textContent);
-        assertEquals(searchEngine.keyword, columns[1].textContent);
-        assertEquals(searchEngine.url, columns[2].textContent);
+        assertEquals(
+            searchEngine.displayName,
+            entry.root.querySelector('#name-column').textContent.trim());
+        assertEquals(
+            searchEngine.keyword,
+            entry.root.querySelector('#keyword-column').textContent);
+        assertEquals(
+            searchEngine.url,
+            entry.root.querySelector('#url-column').textContent);
       });
 
       test('Remove_Enabled', function() {
         // Open action menu.
         MockInteractions.tap(entry.$$('paper-icon-button'));
         var menu = entry.$$('dialog[is=cr-action-menu]');
         assertTrue(menu.open);
 
         var deleteButton = entry.$.delete;
         assertTrue(!!deleteButton);
@@ skipping 202 matching lines @@
 
   return {
     registerTests: function() {
       registerDialogTests();
       registerSearchEngineEntryTests();
       registerOmniboxExtensionEntryTests();
       registerPageTests();
     },
   };
 });