Standardize usage of virtual/override/final specifiers.

ash/wm/toplevel_window_event_handler.h

Index: ash/wm/toplevel_window_event_handler.h
diff --git a/ash/wm/toplevel_window_event_handler.h b/ash/wm/toplevel_window_event_handler.h
index 4e6dc1b8e0a04f7f71061fd85464221a57c86fa8..ce744a9ca77df4430324127ee4b60cdb783d48c8 100644
--- a/ash/wm/toplevel_window_event_handler.h
+++ b/ash/wm/toplevel_window_event_handler.h
@@ -36,22 +36,22 @@ class ASH_EXPORT ToplevelWindowEventHandler
       public DisplayController::Observer {
  public:
   ToplevelWindowEventHandler();
-  virtual ~ToplevelWindowEventHandler();
+  ~ToplevelWindowEventHandler() override;
 
   // Overridden from ui::EventHandler:
-  virtual void OnKeyEvent(ui::KeyEvent* event) override;
-  virtual void OnMouseEvent(ui::MouseEvent* event) override;
-  virtual void OnGestureEvent(ui::GestureEvent* event) override;
+  void OnKeyEvent(ui::KeyEvent* event) override;
+  void OnMouseEvent(ui::MouseEvent* event) override;
+  void OnGestureEvent(ui::GestureEvent* event) override;
 
   // Overridden form aura::client::WindowMoveClient:
-  virtual aura::client::WindowMoveResult RunMoveLoop(
+  aura::client::WindowMoveResult RunMoveLoop(
       aura::Window* source,
       const gfx::Vector2d& drag_offset,
       aura::client::WindowMoveSource move_source) override;
-  virtual void EndMoveLoop() override;
+  void EndMoveLoop() override;
 
   // Overridden form ash::DisplayController::Observer:
-  virtual void OnDisplayConfigurationChanging() override;
+  void OnDisplayConfigurationChanging() override;
 
  private:
   class ScopedWindowResizer;