No need to pass DownloadItemModel ownership.

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

Index: chrome/browser/ui/cocoa/download/download_item_controller.h
diff --git a/chrome/browser/ui/cocoa/download/download_item_controller.h b/chrome/browser/ui/cocoa/download/download_item_controller.h
index 1c5a6c3f6859371704b09dc1c2e4db0f0d9e6167..b7b25f5f866d92c0f2e5b7aa8d6e02ca0df708ec 100644
--- a/chrome/browser/ui/cocoa/download/download_item_controller.h
+++ b/chrome/browser/ui/cocoa/download/download_item_controller.h
@@ -71,10 +71,10 @@ class Font;
   } 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;