Standardize usage of virtual/override/final specifiers.

ash/frame/caption_buttons/frame_size_button.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_FRAME_CAPTION_BUTTONS_FRAME_SIZE_BUTTON_H_
 #define ASH_FRAME_CAPTION_BUTTONS_FRAME_SIZE_BUTTON_H_
 
 #include "ash/ash_export.h"
 #include "ash/frame/caption_buttons/frame_caption_button.h"
 #include "ash/frame/caption_buttons/frame_size_button_delegate.h"
@@ skipping 15 matching lines @@
 //   left and to snap right. The button underneath the mouse is hovered.
 // When the drag terminates, the action for the button underneath the mouse
 // is executed. For the sake of simplicity, the size button is the event
 // handler for a click starting on the size button and the entire drag.
 class ASH_EXPORT FrameSizeButton : public FrameCaptionButton {
  public:
   FrameSizeButton(views::ButtonListener* listener,
                   views::Widget* frame,
                   FrameSizeButtonDelegate* delegate);
 
-  virtual ~FrameSizeButton();
+  ~FrameSizeButton() override;
 
   // views::CustomButton overrides:
-  virtual bool OnMousePressed(const ui::MouseEvent& event) override;
-  virtual bool OnMouseDragged(const ui::MouseEvent& event) override;
-  virtual void OnMouseReleased(const ui::MouseEvent& event) override;
-  virtual void OnMouseCaptureLost() override;
-  virtual void OnMouseMoved(const ui::MouseEvent& event) override;
-  virtual void OnGestureEvent(ui::GestureEvent* event) override;
+  bool OnMousePressed(const ui::MouseEvent& event) override;
+  bool OnMouseDragged(const ui::MouseEvent& event) override;
+  void OnMouseReleased(const ui::MouseEvent& event) override;
+  void OnMouseCaptureLost() override;
+  void OnMouseMoved(const ui::MouseEvent& event) override;
+  void OnGestureEvent(ui::GestureEvent* event) override;
 
   void set_delay_to_set_buttons_to_snap_mode(int delay_ms) {
     set_buttons_to_snap_mode_delay_ms_ = delay_ms;
   }
 
  private:
   enum SnapType {
     SNAP_LEFT,
     SNAP_RIGHT,
     SNAP_NONE
@@ skipping 57 matching lines @@
   // snapping the window left or right. The preview is only visible if the snap
   // left or snap right button is pressed.
   scoped_ptr<PhantomWindowController> phantom_window_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(FrameSizeButton);
 };
 
 }  // namespace ash
 
 #endif  // ASH_FRAME_CAPTION_BUTTONS_FRAME_SIZE_BUTTON_H_