No need to pass DownloadItemModel ownership.

chrome/browser/ui/cocoa/download/download_item_controller.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.
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/time.h"
 
 @class ChromeUILocalizer;
@@ skipping 53 matching lines @@
   // Default font to use for text metrics.
   scoped_ptr<gfx::Font> font_;
 
   // The state of this item.
   enum DownoadItemState {
     kNormal,
     kDangerous
   } state_;
 };
 
-// Takes ownership of |downloadModel|.
-- (id)initWithModel:(DownloadItemModel*)downloadModel
-              shelf:(DownloadShelfController*)shelf
-          navigator:(content::PageNavigator*)navigator;
+// Initialize controller for |downloadItem|.
+- (id)initWithDownload:(content::DownloadItem*)downloadItem
+                 shelf:(DownloadShelfController*)shelf
+             navigator:(content::PageNavigator*)navigator;
 
 // Updates the UI and menu state from |downloadModel|.
 - (void)setStateFromDownload:(DownloadItemModel*)downloadModel;
 
 // Remove ourself from the download UI.
 - (void)remove;
 
 // Update item's visibility depending on if the item is still completely
 // contained in its parent.
 - (void)updateVisibility:(id)sender;
@@ skipping 23 matching lines @@
 - (IBAction)discardDownload:(id)sender;
 
 // Context menu handlers.
 - (IBAction)handleOpen:(id)sender;
 - (IBAction)handleAlwaysOpen:(id)sender;
 - (IBAction)handleReveal:(id)sender;
 - (IBAction)handleCancel:(id)sender;
 - (IBAction)handleTogglePause:(id)sender;
 
 @end