No need to pass DownloadItemModel ownership.

chrome/browser/ui/views/download/download_shelf_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_DOWNLOAD_DOWNLOAD_SHELF_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_DOWNLOAD_DOWNLOAD_SHELF_VIEW_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "chrome/browser/download/download_shelf.h"
 #include "ui/base/animation/animation_delegate.h"
 #include "ui/views/accessible_pane_view.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/controls/link_listener.h"
 #include "ui/views/mouse_watcher.h"
 
 class Browser;
 class BrowserView;
 class DownloadItemView;
-class DownloadItemModel;
 
 namespace content {
+class DownloadItem;
 class PageNavigator;
 }
 
 namespace ui {
 class SlideAnimation;
 }
 
 namespace views {
 class ImageButton;
 class ImageView;
@@ skipping 56 matching lines @@
                                  View* focused_now) OVERRIDE;
   virtual void OnDidChangeFocus(View* focused_before,
                                 View* focused_now) OVERRIDE;
 
   // Removes a specified download view. The supplied view is deleted after
   // it's removed.
   void RemoveDownloadView(views::View* view);
 
  protected:
   // Implementation of DownloadShelf.
-  virtual void DoAddDownload(DownloadItemModel* download_model) OVERRIDE;
+  virtual void DoAddDownload(content::DownloadItem* download) OVERRIDE;
   virtual void DoShow() OVERRIDE;
   virtual void DoClose() OVERRIDE;
 
   // From AccessiblePaneView
   virtual views::View* GetDefaultFocusableChild() OVERRIDE;
 
  private:
   // Adds a View representing a download to this DownloadShelfView.
   // DownloadShelfView takes ownership of the View, and will delete it as
   // necessary.
@@ skipping 56 matching lines @@
 
   // Whether we are auto-closing.
   bool auto_closed_;
 
   views::MouseWatcher mouse_watcher_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadShelfView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_DOWNLOAD_DOWNLOAD_SHELF_VIEW_H_