Standardize usage of virtual/override/final specifiers.

ui/wm/core/visibility_controller.h

 // Copyright (c) 2012 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_WM_CORE_VISIBILITY_CONTROLLER_H_
 #define UI_WM_CORE_VISIBILITY_CONTROLLER_H_
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "ui/aura/client/visibility_client.h"
 #include "ui/wm/wm_export.h"
 
 namespace wm {
 
 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
   // this function.
   // TODO(beng): potentially replace by an actual window animator class in
   //             window_animations.h.
   virtual bool CallAnimateOnChildWindowVisibilityChanged(aura::Window* window,
                                                          bool visible);
 
  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);
 };
 
 // Suspends the animations for visibility changes during the lifetime of an
 // instance of this class.
 //
 // Example:
 //
 // void ViewName::UnanimatedAction() {
@@ skipping 22 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(SuspendChildWindowVisibilityAnimations);
 };
 
 // Tells |window| to animate visibility changes to its children.
 void WM_EXPORT SetChildWindowVisibilityChangesAnimated(
     aura::Window* window);
 
 }  // namespace wm
 
 #endif  // UI_WM_CORE_VISIBILITY_CONTROLLER_H_