Standardize usage of virtual/override/final in content/browser/

content/browser/service_worker/service_worker_unregister_job.h

Index: content/browser/service_worker/service_worker_unregister_job.h
diff --git a/content/browser/service_worker/service_worker_unregister_job.h b/content/browser/service_worker/service_worker_unregister_job.h
index 6a4899fd0ea8df1896c3d0f1873c87a4a0a40ac4..fef9c272de64afc7922beb20022cc7777eb06581 100644
--- a/content/browser/service_worker/service_worker_unregister_job.h
+++ b/content/browser/service_worker/service_worker_unregister_job.h
@@ -32,17 +32,17 @@ class ServiceWorkerUnregisterJob : public ServiceWorkerRegisterJobBase {
 
   ServiceWorkerUnregisterJob(base::WeakPtr<ServiceWorkerContextCore> context,
                              const GURL& pattern);
-  virtual ~ServiceWorkerUnregisterJob();
+  ~ServiceWorkerUnregisterJob() override;
 
   // Registers a callback to be called when the job completes (whether
   // successfully or not). Multiple callbacks may be registered.
   void AddCallback(const UnregistrationCallback& callback);
 
   // ServiceWorkerRegisterJobBase implementation:
-  virtual void Start() override;
-  virtual void Abort() override;
-  virtual bool Equals(ServiceWorkerRegisterJobBase* job) override;
-  virtual RegistrationJobType GetType() override;
+  void Start() override;
+  void Abort() override;
+  bool Equals(ServiceWorkerRegisterJobBase* job) override;
+  RegistrationJobType GetType() override;
 
  private:
   void OnRegistrationFound(