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

chrome/browser/extensions/api/downloads/downloads_api.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_EXTENSIONS_API_DOWNLOADS_DOWNLOADS_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_DOWNLOADS_DOWNLOADS_API_H_
 #pragma once
 
 #include <map>
 #include <set>
@@ skipping 338 matching lines @@
 // onCreated and onErased events.
 class ExtensionDownloadsEventRouter : public content::DownloadManager::Observer,
                                       public content::DownloadItem::Observer {
  public:
   explicit ExtensionDownloadsEventRouter(Profile* profile);
   virtual ~ExtensionDownloadsEventRouter();
 
   virtual void ModelChanged(content::DownloadManager* manager) OVERRIDE;
   virtual void ManagerGoingDown(content::DownloadManager* manager) OVERRIDE;
   virtual void OnDownloadUpdated(content::DownloadItem* download) OVERRIDE;
-  virtual void OnDownloadOpened(content::DownloadItem* download) OVERRIDE;
+  virtual void OnDownloadRemoved(content::DownloadItem* download) OVERRIDE;
+  virtual void OnDownloadDestructed(content::DownloadItem* download) OVERRIDE;
 
  private:
   struct OnChangedStat {
     OnChangedStat();
     ~OnChangedStat();
     int fires;
     int total;
   };
 
   typedef std::map<int, content::DownloadItem*> ItemMap;
   typedef std::map<int, base::DictionaryValue*> ItemJsonMap;
   typedef std::map<int, OnChangedStat*> OnChangedStatMap;
 
   void Init(content::DownloadManager* manager);
   void DispatchEvent(const char* event_name, base::Value* json_arg);
 
   Profile* profile_;
   content::DownloadManager* manager_;
   ItemMap downloads_;
   ItemJsonMap item_jsons_;
   OnChangedStatMap on_changed_stats_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionDownloadsEventRouter);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_DOWNLOADS_DOWNLOADS_API_H_