C++11 override style change for athena

athena/screen/modal_window_controller.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_MODAL_WINDOW_CONTROLLER_H_
 #define ATHENA_SCREEN_MODAL_WINDOW_CONTROLLER_H_
 
 #include "athena/athena_export.h"
 #include "ui/aura/window_observer.h"
 
 namespace athena {
 
 // ModalWindow controller manages the modal window and
 // its container. This gets created when a modal window is opened
 // and deleted when all modal windows are deleted.
 class ATHENA_EXPORT ModalWindowController : public aura::WindowObserver {
  public:
   // Returns the ModalWindowController associated with the container.
   static ModalWindowController* Get(aura::Window* container);
 
   explicit ModalWindowController(int container_priority);
-  virtual ~ModalWindowController();
+  ~ModalWindowController() override;
 
   aura::Window* modal_container() { return modal_container_; }
 
   bool dimmed() const { return dimmed_; }
 
  private:
   // aura::WindowObserver:
   virtual void OnWindowAdded(aura::Window* child) override;
   virtual void OnWindowVisibilityChanged(aura::Window* window,
                                          bool visible) override;
@@ skipping 17 matching lines @@
   aura::Window* modal_container_;  // not owned.
   aura::Window* dimmer_window_;    // not owned.
 
   bool dimmed_;
   DISALLOW_COPY_AND_ASSIGN(ModalWindowController);
 };
 
 }  // namespace athena
 
 #endif  // ATHENA_SCREEN_MODAL_WINDOW_CONTROLLER_H_