Standardize usage of virtual/override/final specifiers.

ash/system/user/button_from_view.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 ASH_SYSTEM_USER_BUTTON_FROM_VIEW_H_
 #define ASH_SYSTEM_USER_BUTTON_FROM_VIEW_H_
 
 #include "base/macros.h"
 #include "ui/gfx/insets.h"
 #include "ui/views/controls/button/custom_button.h"
 
 namespace ash {
 namespace tray {
 
 // This view is used to wrap it's content and transform it into button.
 class ButtonFromView : public views::CustomButton {
  public:
   // The |content| is the content which is shown within the button. The
   // |button_listener| will be informed - if provided - when a button was
   // pressed. If |highlight_on_hover| is set to true, the button will be
   // highlighted upon hover and show the accessibility caret.
   // The |tab_frame_inset| will be used to inset the blue tab frame inside the
   // button.
   ButtonFromView(views::View* content,
                  views::ButtonListener* listener,
                  bool highlight_on_hover,
                  const gfx::Insets& tab_frame_inset);
-  virtual ~ButtonFromView();
+  ~ButtonFromView() override;
 
   // Called when the border should remain even in the non highlighted state.
   void ForceBorderVisible(bool show);
 
   // Overridden from views::View
-  virtual void OnMouseEntered(const ui::MouseEvent& event) override;
-  virtual void OnMouseExited(const ui::MouseEvent& event) override;
-  virtual void OnPaint(gfx::Canvas* canvas) override;
-  virtual void OnFocus() override;
-  virtual void OnBlur() override;
+  void OnMouseEntered(const ui::MouseEvent& event) override;
+  void OnMouseExited(const ui::MouseEvent& event) override;
+  void OnPaint(gfx::Canvas* canvas) override;
+  void OnFocus() override;
+  void OnBlur() override;
 
   // Check if the item is hovered.
   bool is_hovered_for_test() { return button_hovered_; }
 
  private:
   // Change the hover/active state of the "button" when the status changes.
   void ShowActive();
 
   // Content of button.
   views::View* content_;
@@ skipping 10 matching lines @@
   // The insets which get used for the drawn accessibility (tab) frame.
   gfx::Insets tab_frame_inset_;
 
   DISALLOW_COPY_AND_ASSIGN(ButtonFromView);
 };
 
 }  // namespace tray
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_USER_BUTTON_FROM_VIEW_H_