Standardize usage of virtual/override/final specifiers.

ash/system/date/tray_date.h

 // Copyright (c) 2012 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 ASH_SYSTEM_DATE_TRAY_DATE_H_
 #define ASH_SYSTEM_DATE_TRAY_DATE_H_
 
 #include "ash/ash_export.h"
 #include "ash/system/date/clock_observer.h"
 #include "ash/system/tray/system_tray_item.h"
@@ skipping 20 matching lines @@
     VERTICAL_CLOCK,
   };
 
   enum DateAction {
     NONE,
     SET_SYSTEM_TIME,
     SHOW_DATE_SETTINGS,
   };
 
   explicit TrayDate(SystemTray* system_tray);
-  virtual ~TrayDate();
+  ~TrayDate() override;
 
   // Returns view for help button if it is exists. Returns NULL otherwise.
   views::View* GetHelpButtonView() const;
 
   const tray::TimeView* GetTimeTrayForTesting() const;
   const DateDefaultView* GetDefaultViewForTesting() const;
   views::View* CreateDefaultViewForTesting(user::LoginStatus status);
 
  private:
   // Overridden from SystemTrayItem.
-  virtual views::View* CreateTrayView(user::LoginStatus status) override;
-  virtual views::View* CreateDefaultView(user::LoginStatus status) override;
-  virtual views::View* CreateDetailedView(user::LoginStatus status) override;
-  virtual void DestroyTrayView() override;
-  virtual void DestroyDefaultView() override;
-  virtual void DestroyDetailedView() override;
-  virtual void UpdateAfterLoginStatusChange(user::LoginStatus status) override;
-  virtual void UpdateAfterShelfAlignmentChange(
-      ShelfAlignment alignment) override;
+  views::View* CreateTrayView(user::LoginStatus status) override;
+  views::View* CreateDefaultView(user::LoginStatus status) override;
+  views::View* CreateDetailedView(user::LoginStatus status) override;
+  void DestroyTrayView() override;
+  void DestroyDefaultView() override;
+  void DestroyDetailedView() override;
+  void UpdateAfterLoginStatusChange(user::LoginStatus status) override;
+  void UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) override;
 
   // Overridden from ClockObserver.
-  virtual void OnDateFormatChanged() override;
-  virtual void OnSystemClockTimeUpdated() override;
-  virtual void OnSystemClockCanSetTimeChanged(bool can_set_time) override;
-  virtual void Refresh() override;
+  void OnDateFormatChanged() override;
+  void OnSystemClockTimeUpdated() override;
+  void OnSystemClockCanSetTimeChanged(bool can_set_time) override;
+  void Refresh() override;
 
   void SetupLabelForTimeTray(views::Label* label);
 
   tray::TimeView* time_tray_;
   DateDefaultView* default_view_;
   user::LoginStatus login_status_;
 
 #if defined(OS_CHROMEOS)
   scoped_ptr<SystemClockObserver> system_clock_observer_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(TrayDate);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_DATE_TRAY_DATE_H_