Update {virtual,override,final} to follow C++11 style in extensions, round 2.

extensions/browser/api/vpn_provider/vpn_provider_api.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_BROWSER_EXTENSIONS_API_VPN_PROVIDER_VPN_PROVIDER_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_VPN_PROVIDER_VPN_PROVIDER_API_H_
 
 #include <string>
 
 #include "extensions/browser/extension_function.h"
 
 namespace extensions {
 
 class VpnThreadExtensionFunction : public UIThreadExtensionFunction {
  public:
   void SignalCallCompletionSuccess();
 
   void SignalCallCompletionFailure(const std::string& error_name,
                                    const std::string& error_message);
 
  protected:
-  virtual ~VpnThreadExtensionFunction();
+  ~VpnThreadExtensionFunction() override;
 };
 
 class VpnProviderCreateConfigFunction : public VpnThreadExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("vpnProvider.createConfig",
                              VPNPROVIDER_CREATECONFIG);
 
  protected:
-  virtual ~VpnProviderCreateConfigFunction();
+  ~VpnProviderCreateConfigFunction() override;
 
-  virtual ExtensionFunction::ResponseAction Run() override;
+  ExtensionFunction::ResponseAction Run() override;
 };
 
 class VpnProviderDestroyConfigFunction : public VpnThreadExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("vpnProvider.destroyConfig",
                              VPNPROVIDER_DESTROYCONFIG);
 
  protected:
-  virtual ~VpnProviderDestroyConfigFunction();
+  ~VpnProviderDestroyConfigFunction() override;
 
-  virtual ExtensionFunction::ResponseAction Run() override;
+  ExtensionFunction::ResponseAction Run() override;
 };
 
 class VpnProviderSetParametersFunction : public VpnThreadExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("vpnProvider.setParameters",
                              VPNPROVIDER_SETPARAMETERS);
 
  protected:
-  virtual ~VpnProviderSetParametersFunction();
+  ~VpnProviderSetParametersFunction() override;
 
-  virtual ExtensionFunction::ResponseAction Run() override;
+  ExtensionFunction::ResponseAction Run() override;
 };
 
 class VpnProviderSendPacketFunction : public VpnThreadExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("vpnProvider.sendPacket", VPNPROVIDER_SENDPACKET);
 
  protected:
-  virtual ~VpnProviderSendPacketFunction();
+  ~VpnProviderSendPacketFunction() override;
 
-  virtual ExtensionFunction::ResponseAction Run() override;
+  ExtensionFunction::ResponseAction Run() override;
 };
 
 class VpnProviderNotifyConnectionStateChangedFunction
     : public VpnThreadExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("vpnProvider.notifyConnectionStateChanged",
                              VPNPROVIDER_NOTIFYCONNECTIONSTATECHANGED);
 
  protected:
-  virtual ~VpnProviderNotifyConnectionStateChangedFunction();
+  ~VpnProviderNotifyConnectionStateChangedFunction() override;
 
-  virtual ExtensionFunction::ResponseAction Run() override;
+  ExtensionFunction::ResponseAction Run() override;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_VPN_PROVIDER_VPN_PROVIDER_API_H_