Standardize usage of virtual/override/final specifiers.

ash/keyboard_overlay/keyboard_overlay_view.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_KEYBOARD_OVERLAY_KEYBOARD_OVERLAY_VIEW_H_
 #define ASH_KEYBOARD_OVERLAY_KEYBOARD_OVERLAY_VIEW_H_
 
 #include <vector>
 
 #include "ash/content_support/ash_with_content_export.h"
@@ skipping 20 matching lines @@
       public ash::OverlayEventFilter::Delegate {
  public:
   struct KeyEventData {
     ui::KeyboardCode key_code;
     int flags;
   };
 
   KeyboardOverlayView(content::BrowserContext* context,
                       ui::WebDialogDelegate* delegate,
                       WebContentsHandler* handler);
-  virtual ~KeyboardOverlayView();
+  ~KeyboardOverlayView() override;
 
   // Overridden from ash::OverlayEventFilter::Delegate:
-  virtual void Cancel() override;
-  virtual bool IsCancelingKeyEvent(ui::KeyEvent* event) override;
-  virtual aura::Window* GetWindow() override;
+  void Cancel() override;
+  bool IsCancelingKeyEvent(ui::KeyEvent* event) override;
+  aura::Window* GetWindow() override;
 
   // Shows the keyboard overlay.
   static void ShowDialog(content::BrowserContext* context,
                          WebContentsHandler* handler,
                          const GURL& url);
 
  private:
   FRIEND_TEST_ALL_PREFIXES(KeyboardOverlayViewTest, OpenAcceleratorsClose);
   FRIEND_TEST_ALL_PREFIXES(KeyboardOverlayViewTest, NoRedundantCancelingKeys);
 
   // Overridden from views::WidgetDelegate:
-  virtual void WindowClosing() override;
+  void WindowClosing() override;
 
   static void GetCancelingKeysForTesting(
       std::vector<KeyEventData>* canceling_keys);
 
   DISALLOW_COPY_AND_ASSIGN(KeyboardOverlayView);
 };
 
 }  // namespace ash
 
 #endif  // ASH_KEYBOARD_OVERLAY_KEYBOARD_OVERLAY_VIEW_H_