Update {virtual,override,final} to follow C++11 style in ash.

ash/system/chromeos/supervised/tray_supervised_user_unittest.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 "ash/system/chromeos/supervised/tray_supervised_user.h"
 
 #include "ash/shell.h"
 #include "ash/system/user/login_status.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/test/test_system_tray_delegate.h"
 #include "ui/message_center/message_center.h"
 #include "ui/message_center/notification.h"
 #include "ui/message_center/notification_list.h"
 #include "ui/message_center/notification_types.h"
 
 using message_center::NotificationList;
 
 namespace ash {
 
 class TraySupervisedUserTest : public test::AshTestBase {
  public:
   TraySupervisedUserTest() {}
-  virtual ~TraySupervisedUserTest() {}
+  ~TraySupervisedUserTest() override {}
 
  protected:
   message_center::Notification* GetPopup();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TraySupervisedUserTest);
 };
 
 message_center::Notification* TraySupervisedUserTest::GetPopup() {
   NotificationList::PopupNotifications popups =
       message_center::MessageCenter::Get()->GetPopupNotifications();
   for (NotificationList::PopupNotifications::const_iterator iter =
            popups.begin(); iter != popups.end(); ++iter) {
     if ((*iter)->id() == TraySupervisedUser::kNotificationId)
       return *iter;
   }
   return NULL;
 }
 
 class TraySupervisedUserInitialTest : public TraySupervisedUserTest {
  public:
   TraySupervisedUserInitialTest() {}
-  virtual ~TraySupervisedUserInitialTest() {}
+  ~TraySupervisedUserInitialTest() override {}
 
-  virtual void SetUp() override;
-  virtual void TearDown() override;
+  void SetUp() override;
+  void TearDown() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TraySupervisedUserInitialTest);
 };
 
 void TraySupervisedUserInitialTest::SetUp() {
   test::TestSystemTrayDelegate::SetInitialLoginStatus(
       user::LOGGED_IN_SUPERVISED);
   test::AshTestBase::SetUp();
 }
@@ skipping 18 matching lines @@
 TEST_F(TraySupervisedUserInitialTest, SupervisedUserNoCrash) {
   // Initial login status is already SUPERVISED, which should create
   // the notification and should not cause crashes.
   message_center::Notification* notification = GetPopup();
   ASSERT_NE(static_cast<message_center::Notification*>(NULL), notification);
   EXPECT_EQ(static_cast<int>(message_center::SYSTEM_PRIORITY),
             notification->rich_notification_data().priority);
 }
 
 }  // namespace