Standardize usage of virtual/override/final in chrome/

chrome/common/extensions/api/supervised_user_private/supervised_user_handler.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_COMMON_EXTENSIONS_API_SUPERVISED_USER_PRIVATE_SUPERVISED_USER_HANDLER_H_
 #define CHROME_COMMON_EXTENSIONS_API_SUPERVISED_USER_PRIVATE_SUPERVISED_USER_HANDLER_H_
 
 #include <string>
 
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_resource.h"
 #include "extensions/common/manifest.h"
 #include "extensions/common/manifest_handler.h"
 
 namespace extensions {
 
 struct SupervisedUserInfo : public Extension::ManifestData {
   SupervisedUserInfo();
-  virtual ~SupervisedUserInfo();
+  ~SupervisedUserInfo() override;
 
   static bool IsContentPack(const Extension* extension);
   static ExtensionResource GetContentPackSiteList(const Extension* extension);
 
   // A file containing a list of sites for a supervised user.
   base::FilePath site_list;
 };
 
 // Parses the "content_pack" manifest key for a supervised user.
 class SupervisedUserHandler : public ManifestHandler {
  public:
   SupervisedUserHandler();
-  virtual ~SupervisedUserHandler();
+  ~SupervisedUserHandler() override;
 
-  virtual bool Parse(Extension* extension, base::string16* error) override;
+  bool Parse(Extension* extension, base::string16* error) override;
 
  private:
-  virtual const std::vector<std::string> Keys() const override;
+  const std::vector<std::string> Keys() const override;
 
   bool LoadSites(SupervisedUserInfo* info,
                  const base::DictionaryValue* content_pack_value,
                  base::string16* error);
   bool LoadConfigurations(SupervisedUserInfo* info,
                           const base::DictionaryValue* content_pack_value,
                           base::string16* error);
 
   DISALLOW_COPY_AND_ASSIGN(SupervisedUserHandler);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_COMMON_EXTENSIONS_API_SUPERVISED_USER_PRIVATE_SUPERVISED_USER_HANDLER_H_