No need to pass DownloadItemModel ownership.

chrome/browser/ui/views/download/download_shelf_view.cc

Index: chrome/browser/ui/views/download/download_shelf_view.cc
diff --git a/chrome/browser/ui/views/download/download_shelf_view.cc b/chrome/browser/ui/views/download/download_shelf_view.cc
index 99a060c5bf711f59a8415c3e3e8a80fd07f39d73..22af3587172c41844471c6e2e7368bfce7bc7e0b 100644
--- a/chrome/browser/ui/views/download/download_shelf_view.cc
+++ b/chrome/browser/ui/views/download/download_shelf_view.cc
@@ -120,9 +120,8 @@ void DownloadShelfView::AddDownloadView(DownloadItemView* view) {
   new_item_animation_->Show();
 }
 
-void DownloadShelfView::DoAddDownload(DownloadItemModel* download_model) {
-  DownloadItemView* view = new DownloadItemView(
-      download_model->download(), this, download_model);
+void DownloadShelfView::DoAddDownload(DownloadItem* download) {
+  DownloadItemView* view = new DownloadItemView(download, this);
   AddDownloadView(view);
 }