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

ash/wm/overview/transparent_activate_window_button.cc

 // Copyright 2014 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.
 
 #include "ash/wm/overview/transparent_activate_window_button.h"
 
 #include <vector>
 
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
@@ skipping 17 matching lines @@
     : public views::CustomButton,
       public views::ButtonListener {
  public:
   explicit TransparentButton(TransparentActivateWindowButtonDelegate* delegate);
 
   ~TransparentButton() override;
 
   TransparentActivateWindowButtonDelegate* delegate() { return delegate_; }
 
   // views::View:
-  virtual void OnGestureEvent(ui::GestureEvent* event) override;
+  void OnGestureEvent(ui::GestureEvent* event) override;
 
-  virtual const char* GetClassName() const override {
-    return kTransparentButtonName;
-  }
+  const char* GetClassName() const override { return kTransparentButtonName; }
 
   // views::ButtonListener:
   void ButtonPressed(views::Button* sender, const ui::Event& event) override;
 
  private:
   TransparentActivateWindowButtonDelegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(TransparentButton);
 };
 
@@ skipping 84 matching lines @@
 
 void TransparentActivateWindowButton::StackAbove(
     TransparentActivateWindowButton* activate_button) {
   aura::Window* this_window = event_handler_widget_->GetNativeWindow();
   aura::Window* other_window = activate_button->event_handler_widget_->
       GetNativeWindow();
   this_window->parent()->StackChildAbove(this_window, other_window);
 }
 
 }  // namespace ash