No need to pass DownloadItemModel ownership.

chrome/browser/ui/cocoa/download/download_item_controller.mm

 // 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 "chrome/browser/ui/cocoa/download/download_item_controller.h"
 
 #include "base/mac/bundle_locations.h"
 #include "base/mac/mac_util.h"
 #include "base/metrics/histogram.h"
 #include "base/string16.h"
@@ skipping 56 matching lines @@
     [contentView setAutoresizesSubviews:YES];
   }
 }
 
 }  // namespace
 
 // A class for the chromium-side part of the download shelf context menu.
 
 class DownloadShelfContextMenuMac : public DownloadShelfContextMenu {
  public:
-  DownloadShelfContextMenuMac(DownloadItemModel* model,
+  DownloadShelfContextMenuMac(DownloadItem* downloadItem,
                               content::PageNavigator* navigator)
-      : DownloadShelfContextMenu(model, navigator) { }
+      : DownloadShelfContextMenu(downloadItem, navigator) { }
 
   using DownloadShelfContextMenu::ExecuteCommand;
   using DownloadShelfContextMenu::IsCommandIdChecked;
   using DownloadShelfContextMenu::IsCommandIdEnabled;
 
   using DownloadShelfContextMenu::SHOW_IN_FOLDER;
   using DownloadShelfContextMenu::OPEN_WHEN_COMPLETE;
   using DownloadShelfContextMenu::ALWAYS_OPEN_TYPE;
   using DownloadShelfContextMenu::CANCEL;
   using DownloadShelfContextMenu::TOGGLE_PAUSE;
 };
 
 @interface DownloadItemController (Private)
 - (void)themeDidChangeNotification:(NSNotification*)aNotification;
 - (void)updateTheme:(ui::ThemeProvider*)themeProvider;
 - (void)setState:(DownoadItemState)state;
 @end
 
 // Implementation of DownloadItemController
 
 @implementation DownloadItemController
 
-- (id)initWithModel:(DownloadItemModel*)downloadModel
-              shelf:(DownloadShelfController*)shelf
-          navigator:(content::PageNavigator*)navigator {
+- (id)initWithDownload:(DownloadItem*)downloadItem
+                 shelf:(DownloadShelfController*)shelf
+             navigator:(content::PageNavigator*)navigator {
   if ((self = [super initWithNibName:@"DownloadItem"
                               bundle:base::mac::FrameworkBundle()])) {
     // Must be called before [self view], so that bridge_ is set in awakeFromNib
-    bridge_.reset(new DownloadItemMac(downloadModel, self));
-    menuBridge_.reset(new DownloadShelfContextMenuMac(downloadModel,
+    bridge_.reset(new DownloadItemMac(downloadItem, self));
+    menuBridge_.reset(new DownloadShelfContextMenuMac(downloadItem,
                                                       navigator));
 
     NSNotificationCenter* defaultCenter = [NSNotificationCenter defaultCenter];
     [defaultCenter addObserver:self
                       selector:@selector(themeDidChangeNotification:)
                           name:kBrowserThemeDidChangeNotification
                         object:nil];
 
     shelf_ = shelf;
     state_ = kNormal;
@@ skipping 37 matching lines @@
   // Slide the two buttons over.
   NSPoint frameOrigin = [buttonTweaker_ frame].origin;
   frameOrigin.x += widthChange;
   [buttonTweaker_ setFrameOrigin:frameOrigin];
 
   bridge_->LoadIcon();
   [self updateToolTip];
 }
 
 - (void)setStateFromDownload:(DownloadItemModel*)downloadModel {
-  DCHECK_EQ(bridge_->download_model(), downloadModel);
+  DCHECK_EQ([self download], downloadModel->download());
 
   // Handle dangerous downloads.
   if (downloadModel->IsDangerous()) {
     [self setState:kDangerous];
 
     ResourceBundle& rb = ResourceBundle::GetSharedInstance();
     NSString* dangerousWarning;
     NSString* confirmButtonTitle;
     NSImage* alertIcon;
 
@@ skipping 194 matching lines @@
     [sender setTitle:l10n_util::GetNSStringWithFixup(
         IDS_DOWNLOAD_MENU_PAUSE_ITEM)];
   } else {
     [sender setTitle:l10n_util::GetNSStringWithFixup(
         IDS_DOWNLOAD_MENU_RESUME_ITEM)];
   }
   menuBridge_->ExecuteCommand(DownloadShelfContextMenuMac::TOGGLE_PAUSE);
 }
 
 @end