Fix crash in WebsiteSettingsPopupView::OnWidgetClosing

chrome/browser/ui/views/website_settings/website_settings_popup_view.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_VIEWS_WEBSITE_SETTINGS_WEBSITE_SETTINGS_POPUP_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_WEBSITE_SETTINGS_WEBSITE_SETTINGS_POPUP_VIEW_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 98 matching lines @@
   void ResetConnectionSection(views::View* section_container,
                               const gfx::Image& icon,
                               const string16& headline,
                               const string16& text,
                               views::Link* link);
 
   // The tab contents of the current tab. The popup can't live longer than a
   // tab.
   TabContents* tab_contents_;
 
-  // The presenter that controlls the Website Settings UI.
+  // The presenter that controlls the Website Settings UI. |presenter_| is null
+  // if the popup is opened for a internal chrome url.
   scoped_ptr<WebsiteSettings> presenter_;
 
   PopupHeaderView* header_;  // Owned by views hierarchy.
 
   // The |TabbedPane| that contains the tabs of the Website Settings UI.
   views::TabbedPane* tabbed_pane_;
 
   // The view that contains the contents of the "Cookies and Site data" section
   // from the "Permissions" tab.
   views::View* site_data_content_;
@@ skipping 14 matching lines @@
   // provide a certificate then |cert_id_| is 0.
   int cert_id_;
 
   views::View* connection_info_content_;
   views::View* page_info_content_;
 
   DISALLOW_COPY_AND_ASSIGN(WebsiteSettingsPopupView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_WEBSITE_SETTINGS_WEBSITE_SETTINGS_POPUP_VIEW_H_