No need to pass DownloadItemModel ownership.

chrome/browser/ui/gtk/download/download_item_gtk.h

Index: chrome/browser/ui/gtk/download/download_item_gtk.h
diff --git a/chrome/browser/ui/gtk/download/download_item_gtk.h b/chrome/browser/ui/gtk/download/download_item_gtk.h
index 0efcab4319c9814d3d4e255b6934eb5e5733f89d..e659a7da5433c055dede22e89bbded2fa936dbf0 100644
--- a/chrome/browser/ui/gtk/download/download_item_gtk.h
+++ b/chrome/browser/ui/gtk/download/download_item_gtk.h
@@ -14,6 +14,7 @@
 #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"
@@ -24,7 +25,6 @@
 #include "ui/base/gtk/gtk_signal.h"
 #include "ui/base/gtk/owned_widget_gtk.h"
 
-class DownloadItemModel;
 class DownloadShelfContextMenuGtk;
 class DownloadShelfGtk;
 class GtkThemeService;
@@ -44,7 +44,7 @@ class DownloadItemGtk : public content::DownloadItem::Observer,
  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();
@@ -68,7 +68,7 @@ class DownloadItemGtk : public content::DownloadItem::Observer,
   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;
@@ -199,7 +199,7 @@ class DownloadItemGtk : public content::DownloadItem::Observer,
   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_;