[MD History] Add routing to the synced devices page.

chrome/test/data/webui/md_history/history_synced_tabs_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_synced_tabs_test', function() {
   function createSession(name, windows) {
     return {
       collapsed: false,
       deviceType: '',
       name: name,
@@ skipping 28 matching lines @@
       var getCards = function() {
         return Polymer.dom(element.root).
             querySelectorAll('history-synced-device-card');
       }
 
       suiteSetup(function() {
         app = $('history-app');
         // Not rendered until selected.
         assertEquals(null, app.$$('#synced-devices'));
 
-        app.selectedPage_ = 'synced-devices';
-        assertEquals('synced-devices', app.$['side-bar'].$.menu.selected);
+        app.selectedPage_ = 'syncedTabs';
+        assertEquals('syncedTabs', app.$['side-bar'].$.menu.selected);
         return flush().then(function() {
           element = app.$$('#synced-devices');
           assertTrue(!!element);
         });
       });
 
       test('single card, single window', function() {
         var sessionList = [
           createSession(
               'Nexus 5',
@@ skipping 195 matching lines @@
       teardown(function() {
         element.syncedDevices = [];
         element.searchedTerm = '';
       });
     });
   }
   return {
     registerTests: registerTests
   };
 });