Make DownloadHistory observe manager, items

content/public/browser/download_manager.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.
 //
 // The DownloadManager object manages the process of downloading, including
 // updates to the history system and providing the information for displaying
 // the downloads view in the Destinations tab. There is one DownloadManager per
 // active browser context in Chrome.
 //
 // Download observers:
@@ skipping 170 matching lines @@
   virtual void AddObserver(Observer* observer) = 0;
 
   // Remove a download observer from ourself.
   virtual void RemoveObserver(Observer* observer) = 0;
 
   // Called by the embedder, after creating the download manager, to let it know
   // about downloads from previous runs of the browser.
   virtual void OnPersistentStoreQueryComplete(
       std::vector<DownloadPersistentStoreInfo>* entries) = 0;
 
-  // Called by the embedder, in response to
-  // DownloadManagerDelegate::AddItemToPersistentStore.
-  virtual void OnItemAddedToPersistentStore(int32 download_id,
-                                            int64 db_handle) = 0;
-
   // The number of in progress (including paused) downloads.
   virtual int InProgressCount() const = 0;
 
   virtual BrowserContext* GetBrowserContext() const = 0;
 
   // Checks whether downloaded files still exist. Updates state of downloads
   // that refer to removed files. The check runs in the background and may
   // finish asynchronously after this method returns.
   virtual void CheckForHistoryFilesRemoval() = 0;
 
@@ skipping 17 matching lines @@
  protected:
   virtual ~DownloadManager() {}
 
  private:
   friend class base::RefCountedThreadSafe<DownloadManager>;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_DOWNLOAD_MANAGER_H_