Standardize usage of virtual/override/final specifiers in ash/.

ash/wm/overview/scoped_transform_overview_window.h

 // Copyright 2013 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_WM_OVERVIEW_SCOPED_TRANSFORM_OVERVIEW_WINDOW_H_
 #define ASH_WM_OVERVIEW_SCOPED_TRANSFORM_OVERVIEW_WINDOW_H_
 
 #include "ash/wm/overview/scoped_overview_animation_settings.h"
 #include "ash/wm/overview/transparent_activate_window_button.h"
 #include "ash/wm/overview/transparent_activate_window_button_delegate.h"
@@ skipping 33 matching lines @@
   // aspect ratio).
   static gfx::Rect ShrinkRectToFitPreservingAspectRatio(
       const gfx::Rect& rect,
       const gfx::Rect& bounds);
 
   // Returns the transform turning |src_rect| into |dst_rect|.
   static gfx::Transform GetTransformForRect(const gfx::Rect& src_rect,
                                             const gfx::Rect& dst_rect);
 
   explicit ScopedTransformOverviewWindow(aura::Window* window);
-  virtual ~ScopedTransformOverviewWindow();
+  ~ScopedTransformOverviewWindow() override;
 
   gfx::Transform get_overview_transform() const { return overview_transform_; }
 
   void set_overview_transform(const gfx::Transform& transform) {
     overview_transform_ = transform;
   }
 
   TransparentActivateWindowButton* activate_button() {
     return activate_button_.get();
   }
@@ skipping 81 matching lines @@
 
   // The original opacity of the window before entering overview mode.
   float original_opacity_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedTransformOverviewWindow);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_OVERVIEW_SCOPED_TRANSFORM_OVERVIEW_WINDOW_H_