[MD History] Refactor history.html into a history-app element.

chrome/test/data/webui/md_history/history_synced_tabs_test.js

Index: chrome/test/data/webui/md_history/history_synced_tabs_test.js
diff --git a/chrome/test/data/webui/md_history/history_synced_tabs_test.js b/chrome/test/data/webui/md_history/history_synced_tabs_test.js
index dc2f6d182c365d3419a50fbf40cd35f1ebea970e..3eec5dc67abf72853db84f7e7f4ea40cb4173ee1 100644
--- a/chrome/test/data/webui/md_history/history_synced_tabs_test.js
+++ b/chrome/test/data/webui/md_history/history_synced_tabs_test.js
@@ -28,19 +28,27 @@ cr.define('md_history.history_synced_tabs_test', function() {
 
   function registerTests() {
     suite('synced-tabs', function() {
+      var app;
       var element;
       var sidebarElement;
 
       suiteSetup(function() {
-        element = $('history-synced-device-manager');
-        sidebarElement = $('history-side-bar');
+        app = $('history-app');
+        element = app.$['history-synced-device-manager'];
+        sidebarElement = app.$['history-side-bar'];
       });
 
-      test('sidebar displayed', function() {
-        setForeignSessions([], false);
-        assertTrue(sidebarElement.hidden);
+      test('sidebar displayed', function(done) {
         setForeignSessions([], true);
-        assertFalse(sidebarElement.hidden);
+        flush(function() {
+          assertFalse(sidebarElement.hidden);
+          setForeignSessions([], false);
+          flush(function() {
+            assertTrue(sidebarElement.hidden);
+            done();
+          });
+        });
+
       });
 
       test('single card, single window', function(done) {