Update {virtual,override,final} to follow C++11 style chrome/browser/ui.

chrome/browser/ui/ash/system_tray_delegate_chromeos_browsertest_chromeos.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/ui/ash/system_tray_delegate_chromeos.h"
 
 #include <string>
 #include <vector>
 
 #include "ash/shell.h"
@@ skipping 34 matching lines @@
   tray_date->CreateDefaultViewForTesting(ash::user::LOGGED_IN_NONE);
 }
 
 }  // namespace
 
 class SystemTrayDelegateChromeOSTest : public LoginManagerTest {
  protected:
   SystemTrayDelegateChromeOSTest()
       : LoginManagerTest(false /* should_launch_browser */) {}
 
-  virtual ~SystemTrayDelegateChromeOSTest() {}
+  ~SystemTrayDelegateChromeOSTest() override {}
 
   void SetupUserProfile(std::string user_name, bool use_24_hour_clock) {
     const user_manager::User* user =
         user_manager::UserManager::Get()->FindUser(user_name);
     Profile* profile = ProfileHelper::Get()->GetProfileByUser(user);
     profile->GetPrefs()->SetBoolean(prefs::kUse24HourClock, use_24_hour_clock);
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SystemTrayDelegateChromeOSTest);
@@ skipping 18 matching lines @@
   AddUser(kUser2);
   SetupUserProfile(kUser2, false /* use_24_hour_clock */);
   CreateDefaultView();
   EXPECT_EQ(base::k12HourClock, GetHourType());
   user_manager::UserManager::Get()->SwitchActiveUser(kUser1);
   CreateDefaultView();
   EXPECT_EQ(base::k24HourClock, GetHourType());
 }
 
 }  // namespace chromeos