MD WebUI: Improve tab focus behavior for toolbar search field

chrome/test/data/webui/cr_elements_browsertest.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.
 
 /**
  * @fileoverview Suite of tests for shared cr elements. Currently:
  * <cr-toolbar-search-field>.
  */
 
 /** @const {string} Path to source root. */
@@ skipping 18 matching lines @@
 TEST_F('CrElementsBrowserTest', 'CrToolbarSearchFieldTest', function() {
   suite('cr-toolbar-search-field', function() {
     /** @type {?CrToolbarSearchFieldElement} */
     var field;
     /** @type {?MockSearchFieldDelegate} */
     var delegate;
 
     /** @param {string} term */
     function simulateSearch(term) {
       field.$.searchInput.bindValue = term;
-      field.onSearchTermSearch_();
+      field.onSearchTermSearch();
     }
 
     /**
      * @constructor
      * @implements {SearchFieldDelegate}
      */
     function MockSearchFieldDelegate() {
       /** @type {!Array<string>} */
       this.searches = [];
     }
@@ skipping 60 matching lines @@
       MockInteractions.tap(field);
       simulateSearch('test');
       MockInteractions.blur(field.$.searchInput);
 
       assertTrue(field.showingSearch);
     });
   });
 
   mocha.run();
 });