Disable delegation to picker controller once it is deleted.

chrome/browser/ui/gtk/web_intent_picker_gtk.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_UI_GTK_WEB_INTENT_PICKER_GTK_H_
 #define CHROME_BROWSER_UI_GTK_WEB_INTENT_PICKER_GTK_H_
 
 #include <gtk/gtk.h>
 
 #include <vector>
@@ skipping 39 matching lines @@
   // WebIntentPickerModelObserver implementation.
   virtual void OnModelChanged(WebIntentPickerModel* model) OVERRIDE;
   virtual void OnFaviconChanged(WebIntentPickerModel* model,
                                 size_t index) OVERRIDE;
   virtual void OnExtensionIconChanged(WebIntentPickerModel* model,
                                       const std::string& extension_id) OVERRIDE;
   virtual void OnInlineDisposition(const string16& title,
                                    const GURL& url) OVERRIDE;
 
   virtual void OnPendingAsyncCompleted() OVERRIDE;
+  virtual void InvalidateDelegate() OVERRIDE;
 
   // ConstrainedWindowGtkDelegate implementation.
   virtual GtkWidget* GetWidgetRoot() OVERRIDE;
   virtual GtkWidget* GetFocusWidget() OVERRIDE;
   virtual void DeleteDelegate() OVERRIDE;
   virtual bool GetBackgroundColor(GdkColor* color) OVERRIDE;
   virtual bool ShouldHaveBorderPadding() const OVERRIDE;
 
   // content::NotificationObserver implementation.
   virtual void Observe(int type,
@@ skipping 106 matching lines @@
 
   // content::WebContentsDelegate for the inline disposition dialog.
   scoped_ptr<WebIntentInlineDispositionDelegate> inline_disposition_delegate_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(WebIntentPickerGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_WEB_INTENT_PICKER_GTK_H_