No need to pass DownloadItemModel ownership.

chrome/browser/ui/gtk/download/download_item_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_DOWNLOAD_DOWNLOAD_ITEM_GTK_H_
 #define CHROME_BROWSER_UI_GTK_DOWNLOAD_DOWNLOAD_ITEM_GTK_H_
 
 #include <gtk/gtk.h>
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time.h"
 #include "base/timer.h"
+#include "chrome/browser/download/download_item_model.h"
 #include "chrome/browser/icon_manager.h"
 #include "chrome/common/cancelable_task_tracker.h"
 #include "content/public/browser/download_item.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "ui/base/animation/animation_delegate.h"
 #include "ui/base/animation/slide_animation.h"
 #include "ui/base/gtk/gtk_signal.h"
 #include "ui/base/gtk/owned_widget_gtk.h"
 
-class DownloadItemModel;
 class DownloadShelfContextMenuGtk;
 class DownloadShelfGtk;
 class GtkThemeService;
 class NineBox;
 
 namespace gfx {
 class Image;
 }
 
 namespace ui {
 class SlideAnimation;
 }
 
 class DownloadItemGtk : public content::DownloadItem::Observer,
                         public ui::AnimationDelegate,
                         public content::NotificationObserver {
  public:
   // DownloadItemGtk takes ownership of |download_item_model|.
   DownloadItemGtk(DownloadShelfGtk* parent_shelf,
-                  DownloadItemModel* download_item_model);
+                  content::DownloadItem* download_item);
 
   // Destroys all widgets belonging to this DownloadItemGtk.
   virtual ~DownloadItemGtk();
 
   // content::DownloadItem::Observer implementation.
   virtual void OnDownloadUpdated(content::DownloadItem* download) OVERRIDE;
   virtual void OnDownloadDestroyed(content::DownloadItem* download) OVERRIDE;
   virtual void OnDownloadOpened(content::DownloadItem* download) OVERRIDE;
 
   // ui::AnimationDelegate implementation.
   virtual void AnimationProgressed(const ui::Animation* animation) OVERRIDE;
 
   // Overridden from content::NotificationObserver:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // Called when the icon manager has finished loading the icon. We take
   // ownership of |icon_bitmap|.
   void OnLoadSmallIconComplete(gfx::Image* image);
   void OnLoadLargeIconComplete(gfx::Image* image);
 
   // Returns the DownloadItem model object belonging to this item.
-  content::DownloadItem* get_download();
+  content::DownloadItem* download() { return download_model_.download(); }
 
  private:
   friend class DownloadShelfContextMenuGtk;
 
   // Functions for controlling the progress animation.
   // Repaint the download progress.
   void UpdateDownloadProgress();
 
   // Starts a repeating timer for UpdateDownloadProgress.
   void StartDownloadProgress();
@@ skipping 110 matching lines @@
   ui::OwnedWidgetGtk progress_area_;
 
   // In degrees. Only used for downloads with no known total size.
   int progress_angle_;
 
   // The menu that pops down when the user presses |menu_button_|. We do not
   // create this until the first time we actually need it.
   scoped_ptr<DownloadShelfContextMenuGtk> menu_;
 
   // The download item model we represent.
-  scoped_ptr<DownloadItemModel> download_model_;
+  DownloadItemModel download_model_;
 
   // The dangerous download dialog. This will be null for safe downloads.
   GtkWidget* dangerous_prompt_;
   GtkWidget* dangerous_image_;
   GtkWidget* dangerous_label_;
 
   // An hbox for holding components of the dangerous download dialog.
   ui::OwnedWidgetGtk dangerous_hbox_;
   int dangerous_hbox_start_width_;
   int dangerous_hbox_full_width_;
@@ skipping 30 matching lines @@
 
   // Whether we are currently disabled as part of opening the downloaded file.
   bool disabled_while_opening_;
 
   // Method factory used to delay reenabling of the item when opening the
   // downloaded file.
   base::WeakPtrFactory<DownloadItemGtk> weak_ptr_factory_;
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_DOWNLOAD_DOWNLOAD_ITEM_GTK_H_