Reland DownloadItem::Observer::OnDownloadDestroyed() replaces DownloadItem::REMOVING

chrome/browser/ui/webui/downloads_dom_handler.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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_DOWNLOADS_DOM_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_DOWNLOADS_DOM_HANDLER_H_
 
 #include <vector>
 
 #include "base/compiler_specific.h"
@@ skipping 15 matching lines @@
   explicit DownloadsDOMHandler(content::DownloadManager* dlm);
   virtual ~DownloadsDOMHandler();
 
   void Init();
 
   // WebUIMessageHandler implementation.
   virtual void RegisterMessages() OVERRIDE;
 
   // content::DownloadItem::Observer interface
   virtual void OnDownloadUpdated(content::DownloadItem* download) OVERRIDE;
-  virtual void OnDownloadOpened(content::DownloadItem* download) OVERRIDE { }
+  virtual void OnDownloadDestroyed(content::DownloadItem* download) OVERRIDE;
 
   // content::DownloadManager::Observer interface
   virtual void ModelChanged(content::DownloadManager* manager) OVERRIDE;
   virtual void ManagerGoingDown(content::DownloadManager* manager) OVERRIDE;
 
   // Callback for the "onPageLoaded" message.
   void OnPageLoaded(const base::ListValue* args);
 
   // Callback for the "getDownloads" message.
   void HandleGetDownloads(const base::ListValue* args);
@@ skipping 82 matching lines @@
   // notification should follow close on the heels of such a change.
   typedef std::vector<content::DownloadItem*> OrderedDownloads;
   OrderedDownloads download_items_;
 
   base::WeakPtrFactory<DownloadsDOMHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadsDOMHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_DOWNLOADS_DOM_HANDLER_H_