Make DownloadHistory observe manager, items

content/browser/download/drag_download_file.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 CONTENT_BROWSER_DOWNLOAD_DRAG_DOWNLOAD_FILE_H_
 #define CONTENT_BROWSER_DOWNLOAD_DRAG_DOWNLOAD_FILE_H_
 
 #include "base/compiler_specific.h"
 #include "base/file_path.h"
 #include "base/memory/linked_ptr.h"
@@ skipping 45 matching lines @@
   virtual IStream* GetStream() { return NULL; }
 #endif
 
   // content::DownloadManager::Observer methods.
   // Called on UI thread.
   virtual void ModelChanged(content::DownloadManager* manager) OVERRIDE;
 
   // content::DownloadItem::Observer methods.
   // Called on UI thread.
   virtual void OnDownloadUpdated(content::DownloadItem* download) OVERRIDE;
-  virtual void OnDownloadOpened(content::DownloadItem* download) OVERRIDE { }
+  virtual void OnDownloadDestroyed(content::DownloadItem* download) OVERRIDE;
 
  private:
   // Called on drag-and-drop thread (Windows).
   // Called on UI thread (Windows).
   virtual ~DragDownloadFile();
 
   // Called on drag-and-drop thread (Windows only).
 #if defined(OS_WIN)
   void StartNestedMessageLoop();
   void QuitNestedMessageLoop();
@@ skipping 36 matching lines @@
 
   // Access on UI thread.
   content::DownloadManager* download_manager_;
   bool download_manager_observer_added_;
   content::DownloadItem* download_item_;
 
   DISALLOW_COPY_AND_ASSIGN(DragDownloadFile);
 };
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DRAG_DOWNLOAD_FILE_H_