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

chrome/browser/extensions/extension_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_EXTENSION_INFOBAR_DELEGATE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_INFOBAR_DELEGATE_H_
 #pragma once
 
 #include "chrome/browser/tab_contents/confirm_infobar_delegate.h"
 
@@ skipping 25 matching lines @@
   ExtensionHost* extension_host() { return extension_host_.get(); }
 
   void set_observer(DelegateObserver* observer) { observer_ = observer; }
 
   bool closing() const { return closing_; }
 
  private:
   virtual ~ExtensionInfoBarDelegate();
 
   // InfoBarDelegate:
-  virtual InfoBar* CreateInfoBar();
-  virtual bool EqualsDelegate(InfoBarDelegate* delegate) const;
-  virtual void InfoBarDismissed();
-  virtual void InfoBarClosed();
-  virtual Type GetInfoBarType() const;
-  virtual ExtensionInfoBarDelegate* AsExtensionInfoBarDelegate();
+  virtual InfoBar* CreateInfoBar() OVERRIDE;
+  virtual bool EqualsDelegate(InfoBarDelegate* delegate) const OVERRIDE;
+  virtual void InfoBarDismissed() OVERRIDE;
+  virtual Type GetInfoBarType() const OVERRIDE;
+  virtual ExtensionInfoBarDelegate* AsExtensionInfoBarDelegate() OVERRIDE;
 
   // NotificationObserver:
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
-                       const NotificationDetails& details);
+                       const NotificationDetails& details) OVERRIDE;
 
   // The extension host we are showing the InfoBar for. The delegate needs to
   // own this since the InfoBar gets deleted and recreated when you switch tabs
   // and come back (and we don't want the user's interaction with the InfoBar to
   // get lost at that point).
   scoped_ptr<ExtensionHost> extension_host_;
 
   // The observer monitoring when the delegate dies.
   DelegateObserver* observer_;
 
   const Extension* extension_;
   TabContents* tab_contents_;
   NotificationRegistrar registrar_;
 
   // Whether we are currently animating to close. This is used to ignore
   // ExtensionView::PreferredSizeChanged notifications.
   bool closing_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionInfoBarDelegate);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_INFOBAR_DELEGATE_H_