Standardize usage of virtual/override/final specifiers.

ash/wm/maximize_mode/scoped_disable_internal_mouse_and_keyboard_x11.h

Index: ash/wm/maximize_mode/scoped_disable_internal_mouse_and_keyboard_x11.h
diff --git a/ash/wm/maximize_mode/scoped_disable_internal_mouse_and_keyboard_x11.h b/ash/wm/maximize_mode/scoped_disable_internal_mouse_and_keyboard_x11.h
index acde87fbfb2d75be80cc32af04e8f3795c372fca..1b1ae9694ca68f0761b3e281e89eb604b8fdf5ce 100644
--- a/ash/wm/maximize_mode/scoped_disable_internal_mouse_and_keyboard_x11.h
+++ b/ash/wm/maximize_mode/scoped_disable_internal_mouse_and_keyboard_x11.h
@@ -22,11 +22,12 @@ class ScopedDisableInternalMouseAndKeyboardX11
       public ui::PlatformEventObserver {
  public:
   ScopedDisableInternalMouseAndKeyboardX11();
-  virtual ~ScopedDisableInternalMouseAndKeyboardX11();
+  ~ScopedDisableInternalMouseAndKeyboardX11() override;
 
   // ui::PlatformEventObserver:
-  virtual void WillProcessEvent(const ui::PlatformEvent& event) override;
-  virtual void DidProcessEvent(const ui::PlatformEvent& event) override;
+  void WillProcessEvent(const ui::PlatformEvent& event) override;
+  void DidProcessEvent(const ui::PlatformEvent& event) override;
+
  private:
   int touchpad_device_id_;
   int keyboard_device_id_;