Replace the virtual InfoBarDelegate::InfoBarClosed() function with a non-virtual one. This is a ...

chrome/browser/extensions/theme_installed_infobar_delegate.h

 // Copyright (c) 2011 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_THEME_INSTALLED_INFOBAR_DELEGATE_H_
 #define CHROME_BROWSER_EXTENSIONS_THEME_INSTALLED_INFOBAR_DELEGATE_H_
 #pragma once
 
 #include "chrome/browser/tab_contents/confirm_infobar_delegate.h"
 #include "content/common/notification_registrar.h"
@@ skipping 20 matching lines @@
  protected:
   virtual ~ThemeInstalledInfoBarDelegate();
 
   ThemeService* theme_service() { return theme_service_; }
 
   // ConfirmInfoBarDelegate:
   virtual bool Cancel();
 
  private:
   // ConfirmInfoBarDelegate:
-  virtual void InfoBarClosed();
-  virtual gfx::Image* GetIcon() const;
-  virtual ThemeInstalledInfoBarDelegate* AsThemePreviewInfobarDelegate();
-  virtual string16 GetMessageText() const;
-  virtual int GetButtons() const;
-  virtual string16 GetButtonLabel(InfoBarButton button) const;
+  virtual gfx::Image* GetIcon() const OVERRIDE;
+  virtual ThemeInstalledInfoBarDelegate*
+      AsThemePreviewInfobarDelegate() OVERRIDE;
+  virtual string16 GetMessageText() const OVERRIDE;
+  virtual int GetButtons() const OVERRIDE;
+  virtual string16 GetButtonLabel(InfoBarButton button) const OVERRIDE;
 
   // NotificationObserver:
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
-                       const NotificationDetails& details);
+                       const NotificationDetails& details) OVERRIDE;
 
   Profile* profile_;
   ThemeService* theme_service_;
 
   // Name of theme that's just been installed.
   std::string name_;
 
   // ID of theme that's just been installed.
   std::string theme_id_;
 
   // Used to undo theme install.
   std::string previous_theme_id_;
   bool previous_using_native_theme_;
 
   // Tab to which this info bar is associated.
   TabContents* tab_contents_;
 
   // Registers and unregisters us for notifications.
   NotificationRegistrar registrar_;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_THEME_INSTALLED_INFOBAR_DELEGATE_H_