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

chrome/installer/util/non_updating_app_registration_data.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 CHROME_INSTALLER_UTIL_NON_UPDATING_APP_REGISTRATION_DATA_H_
 #define CHROME_INSTALLER_UTIL_NON_UPDATING_APP_REGISTRATION_DATA_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "chrome/installer/util/app_registration_data.h"
 
 // Registration data for an app that is not updated by Google Update.
 class NonUpdatingAppRegistrationData : public AppRegistrationData {
  public:
   explicit NonUpdatingAppRegistrationData(const base::string16& key_path);
-  virtual ~NonUpdatingAppRegistrationData();
-  virtual base::string16 GetAppGuid() const override;
-  virtual base::string16 GetStateKey() const override;
-  virtual base::string16 GetStateMediumKey() const override;
-  virtual base::string16 GetVersionKey() const override;
+  ~NonUpdatingAppRegistrationData() override;
+  base::string16 GetAppGuid() const override;
+  base::string16 GetStateKey() const override;
+  base::string16 GetStateMediumKey() const override;
+  base::string16 GetVersionKey() const override;
 
  private:
   const base::string16 key_path_;
 
   DISALLOW_COPY_AND_ASSIGN(NonUpdatingAppRegistrationData);
 };
 
 #endif  // CHROME_INSTALLER_UTIL_NON_UPDATING_APP_REGISTRATION_DATA_H_