Standardize usage of virtual/override/final specifiers.

ui/views/examples/radio_button_example.h

 // Copyright (c) 2011 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_EXAMPLES_RADIO_BUTTON_EXAMPLE_H_
 #define UI_VIEWS_EXAMPLES_RADIO_BUTTON_EXAMPLE_H_
 
 #include <string>
 
 #include "base/macros.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/examples/example_base.h"
 
 namespace views {
 
 class LabelButton;
 class RadioButton;
 
 namespace examples {
 
 class VIEWS_EXAMPLES_EXPORT RadioButtonExample : public ExampleBase,
                                                  public ButtonListener {
  public:
   RadioButtonExample();
-  virtual ~RadioButtonExample();
+  ~RadioButtonExample() override;
 
   // ExampleBase:
-  virtual void CreateExampleView(View* container) override;
+  void CreateExampleView(View* container) override;
 
  private:
   // ButtonListener:
-  virtual void ButtonPressed(Button* sender, const ui::Event& event) override;
+  void ButtonPressed(Button* sender, const ui::Event& event) override;
 
   // Group of 3 radio buttons.
   RadioButton* radio_buttons_[3];
 
   // Control button to select radio buttons, and show the status of buttons.
   LabelButton* select_;
   LabelButton* status_;
 
   // The number of times the button is pressed.
   int count_;
 
   DISALLOW_COPY_AND_ASSIGN(RadioButtonExample);
 };
 
 }  // namespace examples
 }  // namespace views
 
 #endif  // UI_VIEWS_EXAMPLES_RADIO_BUTTON_EXAMPLE_H_