Standardize usage of virtual/override/final in chrome/browser/signin/

chrome/browser/signin/fake_account_reconcilor.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_SIGNIN_FAKE_ACCOUNT_RECONCILOR_H_
 #define CHROME_BROWSER_SIGNIN_FAKE_ACCOUNT_RECONCILOR_H_
 
 #include "components/signin/core/browser/account_reconcilor.h"
 
 namespace content {
 class BrowserContext;
 }
 
 class FakeAccountReconcilor : public AccountReconcilor {
  public:
   FakeAccountReconcilor(ProfileOAuth2TokenService* token_service,
                         SigninManagerBase* signin_manager,
                         SigninClient* client);
 
   // Helper function to be used with KeyedService::SetTestingFactory().
   static KeyedService* Build(content::BrowserContext* context);
 
  protected:
   // Override this method to perform no network call, instead the callback
   // is called immediately
-  virtual void GetAccountsFromCookie(GetAccountsFromCookieCallback callback)
-      override;
+  void GetAccountsFromCookie(GetAccountsFromCookieCallback callback) override;
 
   DISALLOW_COPY_AND_ASSIGN(FakeAccountReconcilor);
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_FAKE_ACCOUNT_RECONCILOR_H_