Standardize usage of virtual/override/final specifiers.

ui/wm/core/visibility_controller.h

Index: ui/wm/core/visibility_controller.h
diff --git a/ui/wm/core/visibility_controller.h b/ui/wm/core/visibility_controller.h
index d29a6da08542e5e997997c186cf6ca689222d23a..c6f52585f366a89fd610ba7f0f29059bc103a6d0 100644
--- a/ui/wm/core/visibility_controller.h
+++ b/ui/wm/core/visibility_controller.h
@@ -16,7 +16,7 @@ class WM_EXPORT VisibilityController
     : public aura::client::VisibilityClient {
  public:
   VisibilityController();
-  virtual ~VisibilityController();
+  ~VisibilityController() override;
 
  protected:
   // Subclasses override if they want to call a different implementation of
@@ -28,8 +28,7 @@ class WM_EXPORT VisibilityController
 
  private:
   // Overridden from aura::client::VisibilityClient:
-  virtual void UpdateLayerVisibility(aura::Window* window,
-                                     bool visible) override;
+  void UpdateLayerVisibility(aura::Window* window, bool visible) override;
 
   DISALLOW_COPY_AND_ASSIGN(VisibilityController);
 };