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

chrome/browser/chromeos/login/easy_unlock/short_lived_user_context.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_EASY_UNLOCK_SHORT_LIVED_USER_CONTEXT_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_EASY_UNLOCK_SHORT_LIVED_USER_CONTEXT_H_
 
 #include "apps/app_lifetime_monitor.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 
 namespace base {
 class TaskRunner;
 }
 
 namespace chromeos {
 
 class UserContext;
 
 // Stores the UserContext of an authentication operation on the sign-in/lock
 // screen, which is used to generate the keys for Easy Sign-in.
 // The lifetime of the user context is bound the the setup app window. As a
 // fail-safe, the user context will also be deleted after a set period of time
 // in case the app is left open indefintely.
 class ShortLivedUserContext : public apps::AppLifetimeMonitor::Observer {
  public:
   ShortLivedUserContext(const UserContext& user_context,
                         apps::AppLifetimeMonitor* app_lifetime_monitor,
                         base::TaskRunner* task_runner);
-  virtual ~ShortLivedUserContext();
+  ~ShortLivedUserContext() override;
 
   // The UserContext returned here can be NULL if its time-to-live has expired.
   UserContext* user_context() { return user_context_.get(); }
 
  private:
   void Reset();
 
   // apps::AppLifetimeMonitor::Observer:
-  virtual void OnAppDeactivated(Profile* profile,
-                                const std::string& app_id) override;
+  void OnAppDeactivated(Profile* profile, const std::string& app_id) override;
 
   scoped_ptr<UserContext> user_context_;
 
   apps::AppLifetimeMonitor* app_lifetime_monitor_;
 
   base::WeakPtrFactory<ShortLivedUserContext> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ShortLivedUserContext);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_EASY_UNLOCK_SHORT_LIVED_USER_CONTEXT_H_