Update {virtual,override,final} to follow C++11 style in chromeos.

chromeos/timezone/timezone_request.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 CHROMEOS_TIMEZONE_TIMEZONE_REQUEST_H_
 #define CHROMEOS_TIMEZONE_TIMEZONE_REQUEST_H_
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/compiler_specific.h"
@@ skipping 57 matching lines @@
       TimeZoneResponseCallback;
 
   // |url| is the server address to which the request wil be sent.
   // |geoposition| is the location to query timezone for.
   // |retry_timeout| retry request on error until timeout.
   TimeZoneRequest(net::URLRequestContextGetter* url_context_getter,
                   const GURL& service_url,
                   const Geoposition& geoposition,
                   base::TimeDelta retry_timeout);
 
-  virtual ~TimeZoneRequest();
+  ~TimeZoneRequest() override;
 
   // Initiates request.
   // Note: if request object is destroyed before callback is called,
   // request will be silently cancelled.
   void MakeRequest(TimeZoneResponseCallback callback);
 
   void set_retry_sleep_on_server_error_for_testing(
       const base::TimeDelta value) {
     retry_sleep_on_server_error_ = value;
   }
 
   void set_retry_sleep_on_bad_response_for_testing(
       const base::TimeDelta value) {
     retry_sleep_on_bad_response_ = value;
   }
 
  private:
   // net::URLFetcherDelegate
-  virtual void OnURLFetchComplete(const net::URLFetcher* source) override;
+  void OnURLFetchComplete(const net::URLFetcher* source) override;
 
   // Start new request.
   void StartRequest();
 
   // Schedules retry.
   void Retry(bool server_error);
 
   scoped_refptr<net::URLRequestContextGetter> url_context_getter_;
   const GURL service_url_;
   Geoposition geoposition_;
@@ skipping 21 matching lines @@
 
   // Creation and destruction should happen on the same thread.
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(TimeZoneRequest);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_TIMEZONE_TIMEZONE_REQUEST_H_