Make DownloadHistory observe manager, items

chrome/browser/chromeos/gdata/gdata_download_observer.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_CHROMEOS_GDATA_GDATA_DOWNLOAD_OBSERVER_H_
 #define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_DOWNLOAD_OBSERVER_H_
 
 #include <map>
 
 #include "base/callback.h"
@@ skipping 73 matching lines @@
   static void GetGDataTempDownloadPath(const FilePath& gdata_tmp_download_dir,
                                        FilePath* gdata_tmp_download_path);
 
  private:
   // DownloadManager overrides.
   virtual void ManagerGoingDown(content::DownloadManager* manager) OVERRIDE;
   virtual void ModelChanged(content::DownloadManager* manager) OVERRIDE;
 
   // DownloadItem overrides.
   virtual void OnDownloadUpdated(content::DownloadItem* download) OVERRIDE;
-  virtual void OnDownloadOpened(content::DownloadItem* download) OVERRIDE {}
+  virtual void OnDownloadDestroyed(content::DownloadItem* download) OVERRIDE;
 
   // Adds/Removes |download| to pending_downloads_.
   // Also start/stop observing |download|.
   void AddPendingDownload(content::DownloadItem* download);
   void RemovePendingDownload(content::DownloadItem* download);
 
   // Remove our external data and remove our observers from |download|
   void DetachFromDownload(content::DownloadItem* download);
 
   // Starts the upload of a downloaded/downloading file.
@@ skipping 53 matching lines @@
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<GDataDownloadObserver> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GDataDownloadObserver);
 };
 
 }  // namespace gdata
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_DOWNLOAD_OBSERVER_H_