MD History: Use one-way binding for history query state.

chrome/test/data/webui/md_history/history_routing_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('md_history.history_routing_test', function() {
   function registerTests() {
     suite('routing-test', function() {
       var app;
       var list;
       var toolbar;
@@ skipping 37 matching lines @@
         assertEquals('chrome://history/', window.location.href);
         var searchTerm = 'Mei';
         assertEquals('history', app.$.content.selected);
         navigateTo('/?q=' + searchTerm);
         assertEquals(searchTerm, toolbar.searchTerm);
       });
 
       test('route updates from search', function() {
         var searchTerm = 'McCree';
         assertEquals('history', app.$.content.selected);
-        app.set('queryState_.searchTerm', searchTerm);
+        app.fire('change-query', {search: searchTerm});
         assertEquals('chrome://history/?q=' + searchTerm, window.location.href);
       });
 
       test('search preserved across menu items', function() {
         var searchTerm = 'Soldier76';
         var menu = sidebar.$.menu;
         assertEquals('history', app.selectedPage_);
         navigateTo('/?q=' + searchTerm);
 
         MockInteractions.tap(menu.children[1]);
@@ skipping 50 matching lines @@
         }
 
         registerMessageCallback('queryHistory', this, verifyFunction);
       });
     });
   }
   return {
     registerTests: registerTests
   };
 });