Standardize usage of virtual/override/final specifiers.

ui/views/controls/button/checkbox.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 UI_VIEWS_CONTROLS_BUTTON_CHECKBOX_H_
 #define UI_VIEWS_CONTROLS_BUTTON_CHECKBOX_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/strings/string16.h"
 #include "ui/views/controls/button/label_button.h"
 
 namespace views {
 
 // A native themed class representing a checkbox.  This class does not use
 // platform specific objects to replicate the native platforms looks and feel.
 class VIEWS_EXPORT Checkbox : public LabelButton {
  public:
   static const char kViewClassName[];
 
   explicit Checkbox(const base::string16& label);
-  virtual ~Checkbox();
+  ~Checkbox() override;
 
   // Sets a listener for this checkbox. Checkboxes aren't required to have them
   // since their state can be read independently of them being toggled.
   void set_listener(ButtonListener* listener) { listener_ = listener; }
 
   // Sets/Gets whether or not the checkbox is checked.
   virtual void SetChecked(bool checked);
   bool checked() const { return checked_; }
 
  protected:
   // Overridden from LabelButton:
-  virtual void Layout() override;
-  virtual const char* GetClassName() const override;
-  virtual void GetAccessibleState(ui::AXViewState* state) override;
-  virtual void OnFocus() override;
-  virtual void OnBlur() override;
-  virtual const gfx::ImageSkia& GetImage(ButtonState for_state) override;
+  void Layout() override;
+  const char* GetClassName() const override;
+  void GetAccessibleState(ui::AXViewState* state) override;
+  void OnFocus() override;
+  void OnBlur() override;
+  const gfx::ImageSkia& GetImage(ButtonState for_state) override;
 
   // Set the image shown for each button state depending on whether it is
   // [checked] or [focused].
   void SetCustomImage(bool checked,
                       bool focused,
                       ButtonState for_state,
                       const gfx::ImageSkia& image);
 
  private:
   // Overridden from Button:
-  virtual void NotifyClick(const ui::Event& event) override;
+  void NotifyClick(const ui::Event& event) override;
 
-  virtual ui::NativeTheme::Part GetThemePart() const override;
-  virtual void GetExtraParams(
-      ui::NativeTheme::ExtraParams* params) const override;
+  ui::NativeTheme::Part GetThemePart() const override;
+  void GetExtraParams(ui::NativeTheme::ExtraParams* params) const override;
 
   // True if the checkbox is checked.
   bool checked_;
 
   // The images for each button state.
   gfx::ImageSkia images_[2][2][STATE_COUNT];
 
   DISALLOW_COPY_AND_ASSIGN(Checkbox);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_CHECKBOX_H_