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

chrome/browser/drive/drive_notification_manager.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_DRIVE_DRIVE_NOTIFICATION_MANAGER_H_
 #define CHROME_BROWSER_DRIVE_DRIVE_NOTIFICATION_MANAGER_H_
 
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/timer/timer.h"
@@ skipping 11 matching lines @@
 
 // Informs observers when they should check Google Drive for updates.
 // Conditions under which updates should be searched:
 // 1. XMPP invalidation is received from Google Drive.
 // 2. Polling timer counts down.
 class DriveNotificationManager : public KeyedService,
                                  public syncer::InvalidationHandler {
  public:
   explicit DriveNotificationManager(
       invalidation::InvalidationService* invalidation_service);
-  virtual ~DriveNotificationManager();
+  ~DriveNotificationManager() override;
 
   // KeyedService override.
-  virtual void Shutdown() override;
+  void Shutdown() override;
 
   // syncer::InvalidationHandler implementation.
-  virtual void OnInvalidatorStateChange(
-      syncer::InvalidatorState state) override;
-  virtual void OnIncomingInvalidation(
+  void OnInvalidatorStateChange(syncer::InvalidatorState state) override;
+  void OnIncomingInvalidation(
       const syncer::ObjectIdInvalidationMap& invalidation_map) override;
-  virtual std::string GetOwnerName() const override;
+  std::string GetOwnerName() const override;
 
   void AddObserver(DriveNotificationObserver* observer);
   void RemoveObserver(DriveNotificationObserver* observer);
 
   // True when XMPP notification is currently enabled.
   bool push_notification_enabled() const {
     return push_notification_enabled_;
   }
 
   // True when XMPP notification has been registered.
@@ skipping 37 matching lines @@
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<DriveNotificationManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DriveNotificationManager);
 };
 
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_DRIVE_DRIVE_NOTIFICATION_MANAGER_H_