Standardize usage of virtual/override/final specifiers.

ash/wm/overlay_event_filter.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_WM_OVERLAY_EVENT_FILTER_H_
 #define ASH_WM_OVERLAY_EVENT_FILTER_H_
 
 #include "ash/ash_export.h"
 #include "ash/shell_observer.h"
 #include "base/compiler_specific.h"
@@ skipping 19 matching lines @@
 
     // Returns true if the overlay should be canceled in response to |event|.
     virtual bool IsCancelingKeyEvent(ui::KeyEvent* event) = 0;
 
     // Returns the window that needs to receive events. NULL if no window needs
     // to receive key events from OverlayEventFilter.
     virtual aura::Window* GetWindow() = 0;
   };
 
   OverlayEventFilter();
-  virtual ~OverlayEventFilter();
+  ~OverlayEventFilter() override;
 
   // Starts the filtering of events.  It also notifies the specified
   // |delegate| when a key event means cancel (like Esc).  It holds the
   // pointer to the specified |delegate| until Deactivate() is called, but
   // does not take ownership.
   void Activate(Delegate* delegate);
 
   // Ends the filtering of events.
   void Deactivate(Delegate* delegate);
 
   // Cancels the partial screenshot UI.  Do nothing if it's not activated.
   void Cancel();
 
   // Returns true if it's currently active.
   bool IsActive();
 
   // ui::EventHandler overrides:
-  virtual void OnKeyEvent(ui::KeyEvent* event) override;
+  void OnKeyEvent(ui::KeyEvent* event) override;
 
   // ShellObserver overrides:
-  virtual void OnLoginStateChanged(user::LoginStatus status) override;
-  virtual void OnAppTerminating() override;
-  virtual void OnLockStateChanged(bool locked) override;
+  void OnLoginStateChanged(user::LoginStatus status) override;
+  void OnAppTerminating() override;
+  void OnLockStateChanged(bool locked) override;
 
  private:
   FRIEND_TEST_ALL_PREFIXES(PartialScreenshotViewTest, DontStartOverOverlay);
 
   Delegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(OverlayEventFilter);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_OVERLAY_EVENT_FILTER_H_