Dynamic updating recent menu for tabs from other devices.

chrome/browser/ui/browser_tabrestore_browsertest.cc

 // Copyright 2014 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.
 
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/sessions/tab_restore_service_factory.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/browser_live_tab_context.h"
@@ skipping 64 matching lines @@
   BrowserList* active_browser_list = BrowserList::GetInstance();
   EXPECT_EQ(2u, active_browser_list->size());
 
   // Close the first browser.
   CloseBrowser(browser());
   EXPECT_EQ(1u, active_browser_list->size());
 
   // Restore tabs using the browser's recent tabs menu.
   content::DOMMessageQueue queue;
   Browser* browser = active_browser_list->get(0);
-  RecentTabsSubMenuModel menu(NULL, browser, NULL);
+  RecentTabsSubMenuModel menu(nullptr, browser);
   menu.ExecuteCommand(
       RecentTabsSubMenuModel::GetFirstRecentTabsCommandId(), 0);
   AwaitTabsReady(&queue, 2);
 
   // There should be 3 restored tabs in the new browser.
   EXPECT_EQ(2u, active_browser_list->size());
   browser = active_browser_list->get(1);
   EXPECT_EQ(3, browser->tab_strip_model()->count());
   // For the two test tabs we've just received "READY" DOM message.
   // But there won't be such message from the "about:blank" tab.
@@ skipping 67 matching lines @@
           content::NOTIFICATION_LOAD_STOP,
           content::Source<content::NavigationController>(
               &about_blank_contents->GetController()));
       load_stop_observer.Wait();
     }
   }
 
   // The middle tab only should have visible disposition.
   CheckVisbility(browser->tab_strip_model(), 1);
 }