replace OVERRIDE and FINAL with override and final in chrome/browser/extensions/

chrome/browser/extensions/api/identity/identity_signin_flow.h

 // Copyright 2013 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_IDENTITY_IDENTITY_SIGNIN_FLOW_H_
 #define CHROME_BROWSER_EXTENSIONS_API_IDENTITY_IDENTITY_SIGNIN_FLOW_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 22 matching lines @@
   };
 
   IdentitySigninFlow(Delegate* delegate,
                      Profile* profile);
   virtual ~IdentitySigninFlow();
 
   // Starts the flow. Should only be called once.
   void Start();
 
   // OAuth2TokenService::Observer implementation:
-  virtual void OnRefreshTokenAvailable(const std::string& account_id) OVERRIDE;
+  virtual void OnRefreshTokenAvailable(const std::string& account_id) override;
 
  private:
   Delegate* delegate_;
   Profile* profile_;
 
   DISALLOW_COPY_AND_ASSIGN(IdentitySigninFlow);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_IDENTITY_IDENTITY_SIGNIN_FLOW_H_