No need to pass DownloadItemModel ownership.

chrome/browser/download/test_download_shelf.cc

 // 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.
 
 #include "chrome/browser/download/test_download_shelf.h"
 
 TestDownloadShelf::TestDownloadShelf()
     : is_showing_(false) {
 }
 
 TestDownloadShelf::~TestDownloadShelf() {
 }
 
 bool TestDownloadShelf::IsShowing() const {
   return is_showing_;
 }
 
 bool TestDownloadShelf::IsClosing() const {
   return false;
 }
 
 Browser* TestDownloadShelf::browser() const {
   return NULL;
 }
 
-void TestDownloadShelf::DoAddDownload(DownloadItemModel* download_model) {
+void TestDownloadShelf::DoAddDownload(content::DownloadItem* download) {
 }
 
 void TestDownloadShelf::DoShow() {
   is_showing_ = true;
 }
 
 void TestDownloadShelf::DoClose() {
   is_showing_ = false;
 }