No need to pass DownloadItemModel ownership.

chrome/browser/ui/gtk/download/download_shelf_context_menu_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_DOWNLOAD_DOWNLOAD_SHELF_CONTEXT_MENU_GTK_H_
 #define CHROME_BROWSER_UI_GTK_DOWNLOAD_DOWNLOAD_SHELF_CONTEXT_MENU_GTK_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/download/download_shelf_context_menu.h"
 #include "chrome/browser/ui/gtk/menu_gtk.h"
 
 class DownloadItemGtk;
-class DownloadItemModel;
 
 class DownloadShelfContextMenuGtk : public DownloadShelfContextMenu,
                                     public MenuGtk::Delegate {
  public:
-  DownloadShelfContextMenuGtk(DownloadItemModel* model,
-                              DownloadItemGtk* download_item,
+  DownloadShelfContextMenuGtk(DownloadItemGtk* download_item,
                               content::PageNavigator* navigator);
   virtual ~DownloadShelfContextMenuGtk();
 
   void Popup(GtkWidget* widget, GdkEventButton* event);
 
  private:
   // MenuGtk::Delegate:
   virtual void StoppedShowing() OVERRIDE;
   virtual GtkWidget* GetImageForCommandId(int command_id) const OVERRIDE;
 
   // The menu we show on Popup(). We keep a pointer to it for a couple reasons:
   //  * we don't want to have to recreate the menu every time it's popped up.
   //  * we have to keep it in scope for longer than the duration of Popup(), or
   //    completing the user-selected action races against the menu's
   //    destruction.
   scoped_ptr<MenuGtk> menu_;
 
   // The download item that created us.
   DownloadItemGtk* download_item_gtk_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadShelfContextMenuGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_DOWNLOAD_DOWNLOAD_SHELF_CONTEXT_MENU_GTK_H_