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

chrome/browser/extensions/extension_notification_observer.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 CHROME_BROWSER_EXTENSIONS_EXTENSION_NOTIFICATION_OBSERVER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_NOTIFICATION_OBSERVER_H_
 
 #include <set>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_source.h"
 #include "extensions/browser/notification_types.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace extensions {
 
 // Records LOADED, INSTALLED, and UNLOADED notifications for extensions with
 // specific IDs. Use in tests only.
 class ExtensionNotificationObserver : public content::NotificationObserver {
  public:
   ExtensionNotificationObserver(content::NotificationSource source,
                                 const std::set<std::string>& extension_ids);
 
-  virtual ~ExtensionNotificationObserver();
+  ~ExtensionNotificationObserver() override;
 
   // Each of these methods returns a testing::AssertionSuccess if exactly those
   // notifications occurred for any extensions in |extension_ids|, and no more,
   // since the last time any of these methods were called.
   testing::AssertionResult CheckNotifications() WARN_UNUSED_RESULT;
   testing::AssertionResult CheckNotifications(extensions::NotificationType type)
       WARN_UNUSED_RESULT;
   testing::AssertionResult CheckNotifications(extensions::NotificationType t1,
                                               extensions::NotificationType t2)
       WARN_UNUSED_RESULT;
   testing::AssertionResult CheckNotifications(extensions::NotificationType t1,
                                               extensions::NotificationType t2,
                                               extensions::NotificationType t3)
       WARN_UNUSED_RESULT;
   testing::AssertionResult CheckNotifications(extensions::NotificationType t1,
                                               extensions::NotificationType t2,
                                               extensions::NotificationType t3,
                                               extensions::NotificationType t4,
                                               extensions::NotificationType t5,
                                               extensions::NotificationType t6)
       WARN_UNUSED_RESULT;
 
  private:
   // content::NotificationObserver implementation.
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) override;
+  void Observe(int type,
+               const content::NotificationSource& source,
+               const content::NotificationDetails& details) override;
 
   // Checks then clears notifications for our extensions.
   testing::AssertionResult CheckNotifications(
       const std::vector<extensions::NotificationType>& types);
 
   const std::set<std::string> extension_ids_;
   std::vector<extensions::NotificationType> notifications_;
   content::NotificationRegistrar registrar_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_NOTIFICATION_OBSERVER_H_