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

chrome/browser/infobars/simple_alert_infobar_delegate.h

 // Copyright (c) 2012 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_INFOBARS_SIMPLE_ALERT_INFOBAR_DELEGATE_H_
 #define CHROME_BROWSER_INFOBARS_SIMPLE_ALERT_INFOBAR_DELEGATE_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/strings/string16.h"
 #include "components/infobars/core/confirm_infobar_delegate.h"
 
 class InfoBarService;
 
 class SimpleAlertInfoBarDelegate : public ConfirmInfoBarDelegate {
  public:
   // Creates a simple alert infobar and delegate and adds the infobar to
   // |infobar_service|.
   static void Create(InfoBarService* infobar_service,
                      int icon_id,  // May be |kNoIconID| if no icon is shown.
                      const base::string16& message,
                      bool auto_expire);
 
  private:
   SimpleAlertInfoBarDelegate(int icon_id,
                              const base::string16& message,
                              bool auto_expire);
-  virtual ~SimpleAlertInfoBarDelegate();
+  ~SimpleAlertInfoBarDelegate() override;
 
   // ConfirmInfoBarDelegate:
-  virtual int GetIconID() const override;
-  virtual base::string16 GetMessageText() const override;
-  virtual int GetButtons() const override;
-  virtual bool ShouldExpireInternal(
-      const NavigationDetails& details) const override;
+  int GetIconID() const override;
+  base::string16 GetMessageText() const override;
+  int GetButtons() const override;
+  bool ShouldExpireInternal(const NavigationDetails& details) const override;
 
   const int icon_id_;
   base::string16 message_;
   bool auto_expire_;  // Should it expire automatically on navigation?
 
   DISALLOW_COPY_AND_ASSIGN(SimpleAlertInfoBarDelegate);
 };
 
 #endif  // CHROME_BROWSER_INFOBARS_SIMPLE_ALERT_INFOBAR_DELEGATE_H_