C++11 override style change for athena

athena/screen_lock/screen_lock_manager_base.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 ATHENA_SCREEN_LOCK_SCREEN_LOCK_MANAGER_BASE_H_
 #define ATHENA_SCREEN_LOCK_SCREEN_LOCK_MANAGER_BASE_H_
 
 #include "athena/screen_lock/public/screen_lock_manager.h"
 #include "base/macros.h"
 
 namespace athena {
 
 // Base class for ScreenLockManager implementations. Its c-tors remembers
 // instance pointer in global static variable for ScreenLockManager::Get
 // implementation and d-tor clears that global variable.
 class ScreenLockManagerBase : public ScreenLockManager {
  public:
   ScreenLockManagerBase();
 
  protected:
-  virtual ~ScreenLockManagerBase();
+  ~ScreenLockManagerBase() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ScreenLockManagerBase);
 };
 
 }  // namespace athena
 
 #endif  // ATHENA_SCREEN_LOCK_SCREEN_LOCK_MANAGER_BASE_H_