No need to pass DownloadItemModel ownership.

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

Index: chrome/browser/ui/cocoa/download/download_item_controller.mm
diff --git a/chrome/browser/ui/cocoa/download/download_item_controller.mm b/chrome/browser/ui/cocoa/download/download_item_controller.mm
index e89a86effd17aec38350ed6b6f1182b1285c69aa..574756ed433737c11e84782105a5f59ddd10386b 100644
--- a/chrome/browser/ui/cocoa/download/download_item_controller.mm
+++ b/chrome/browser/ui/cocoa/download/download_item_controller.mm
@@ -74,9 +74,9 @@ void WidenView(NSView* view, CGFloat widthChange) {
 
 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;
@@ -99,14 +99,14 @@ class DownloadShelfContextMenuMac : public DownloadShelfContextMenu {
 
 @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];
@@ -164,7 +164,7 @@ class DownloadShelfContextMenuMac : public DownloadShelfContextMenu {
 }
 
 - (void)setStateFromDownload:(DownloadItemModel*)downloadModel {
-  DCHECK_EQ(bridge_->download_model(), downloadModel);
+  DCHECK_EQ([self download], downloadModel->download());
 
   // Handle dangerous downloads.
   if (downloadModel->IsDangerous()) {