ExtensionInfobarGtk doesn't handle delegate going away.

chrome/browser/ui/gtk/infobars/extension_infobar_gtk.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_UI_GTK_INFOBARS_EXTENSION_INFOBAR_GTK_H_
 #define CHROME_BROWSER_UI_GTK_INFOBARS_EXTENSION_INFOBAR_GTK_H_
 
 #include "base/compiler_specific.h"
 #include "chrome/browser/extensions/extension_infobar_delegate.h"
 #include "chrome/browser/ui/gtk/extensions/extension_view_gtk.h"
 #include "chrome/browser/ui/gtk/infobars/infobar_gtk.h"
 #include "chrome/browser/ui/gtk/menu_gtk.h"
 #include "ui/gfx/gtk_util.h"
 
 class ExtensionContextMenuModel;
 class ExtensionResource;
 class ExtensionViewGtk;
 class MenuGtk;
 
 class ExtensionInfoBarGtk : public InfoBarGtk,
-                            public MenuGtk::Delegate {
+                            public MenuGtk::Delegate,
+                            public ExtensionInfoBarDelegate::DelegateObserver {
  public:
   ExtensionInfoBarGtk(InfoBarService* owner,
                       ExtensionInfoBarDelegate* delegate);
   virtual ~ExtensionInfoBarGtk();
 
   // Overridden from InfoBar (through InfoBarGtk):
   virtual void PlatformSpecificHide(bool animate) OVERRIDE;
 
   // Overridden from InfoBarGtk:
   virtual void GetTopColor(InfoBarDelegate::Type type,
                            double* r, double* g, double* b) OVERRIDE;
   virtual void GetBottomColor(InfoBarDelegate::Type type,
                               double* r, double* g, double* b) OVERRIDE;
 
   // Overridden from MenuGtk::Delegate:
   virtual void StoppedShowing() OVERRIDE;
 
+  // Overridden from ExtensionInfoBarDelegate::DelegateObserver:
+  virtual void OnDelegateDeleted() OVERRIDE;
+
  private:
   // Build the widgets of the Infobar.
   void BuildWidgets();
 
   void OnImageLoaded(const gfx::Image& image);
 
   // Looks at the window the infobar is in and gets the browser. Can return
   // NULL if we aren't attached.
   Browser* GetBrowser();
 
@@ skipping 28 matching lines @@
 
   // The model for the current menu displayed.
   scoped_refptr<ExtensionContextMenuModel> context_menu_model_;
 
   base::WeakPtrFactory<ExtensionInfoBarGtk> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionInfoBarGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_INFOBARS_EXTENSION_INFOBAR_GTK_H_