Standardize usage of virtual/override/final in chrome/browser/apps/

chrome/browser/apps/per_app_settings_service.h

 // 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.
 
 #ifndef CHROME_BROWSER_APPS_PER_APP_SETTINGS_SERVICE_H_
 #define CHROME_BROWSER_APPS_PER_APP_SETTINGS_SERVICE_H_
 
 #include <map>
 #include <string>
 
 #include "chrome/browser/ui/host_desktop.h"
 #include "components/keyed_service/core/keyed_service.h"
 
 // Stores settings for apps that only persist until the browser context is
 // destroyed.
 class PerAppSettingsService : public KeyedService {
  public:
   PerAppSettingsService();
-  virtual ~PerAppSettingsService();
+  ~PerAppSettingsService() override;
 
   // Sets/gets the desktop that |app_id| was last launched from.
   void SetDesktopLastLaunchedFrom(
       const std::string& app_id, chrome::HostDesktopType host);
   chrome::HostDesktopType GetDesktopLastLaunchedFrom(
       const std::string& app_id) const;
   bool HasDesktopLastLaunchedFrom(const std::string& app_id) const;
 
  private:
   typedef std::map<std::string, chrome::HostDesktopType> DesktopMap;
   DesktopMap default_desktops_;
 
   DISALLOW_COPY_AND_ASSIGN(PerAppSettingsService);
 };
 
 #endif  // CHROME_BROWSER_APPS_PER_APP_SETTINGS_SERVICE_H_