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

chrome/browser/chromeos/login/enrollment/enterprise_enrollment_helper_impl.cc

 // 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.
 
 #include "chrome/browser/chromeos/login/enrollment/enterprise_enrollment_helper_impl.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 10 matching lines @@
 #include "google_apis/gaia/gaia_auth_consumer.h"
 #include "google_apis/gaia/gaia_auth_fetcher.h"
 #include "google_apis/gaia/gaia_constants.h"
 
 namespace {
 
 // A helper class that takes care of asynchronously revoking a given token.
 class TokenRevoker : public GaiaAuthConsumer {
  public:
   TokenRevoker();
-  virtual ~TokenRevoker();
+  ~TokenRevoker() override;
 
   void Start(const std::string& token);
 
   // GaiaAuthConsumer:
-  virtual void OnOAuth2RevokeTokenCompleted() override;
+  void OnOAuth2RevokeTokenCompleted() override;
 
  private:
   GaiaAuthFetcher gaia_fetcher_;
 
   DISALLOW_COPY_AND_ASSIGN(TokenRevoker);
 };
 
 TokenRevoker::TokenRevoker()
     : gaia_fetcher_(this,
                     GaiaConstants::kChromeOSSource,
@@ skipping 333 matching lines @@
   std::vector<base::Closure> callbacks_to_run;
   callbacks_to_run.swap(auth_clear_callbacks_);
   for (std::vector<base::Closure>::iterator callback(callbacks_to_run.begin());
        callback != callbacks_to_run.end();
        ++callback) {
     callback->Run();
   }
 }
 
 }  // namespace chromeos