sql::MetaTable.next_download_id, DownloadManager::GetNextId()

chrome/browser/download/download_file_manager.h

 // Copyright (c) 2011 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 DownloadFileManager owns a set of DownloadFile objects, each of which
 // represent one in progress download and performs the disk IO for that
 // download. The DownloadFileManager itself is a singleton object owned by the
 // ResourceDispatcherHost.
 //
 // The DownloadFileManager uses the file_thread for performing file write
@@ skipping 54 matching lines @@
 
 // Manages all in progress downloads.
 class DownloadFileManager
     : public base::RefCountedThreadSafe<DownloadFileManager> {
  public:
   explicit DownloadFileManager(ResourceDispatcherHost* rdh);
 
   // Called on shutdown on the UI thread.
   void Shutdown();
 
-  // Called on the IO thread
-  int GetNextId();
-
   // Called on UI thread to make DownloadFileManager start the download.
   void StartDownload(DownloadCreateInfo* info);
 
   // Handlers for notifications sent from the IO thread and run on the
   // FILE thread.
   void UpdateDownload(int id, DownloadBuffer* buffer);
   // |os_error| is 0 for normal completions, and non-0 for errors.
   // |security_info| contains SSL information (cert_id, cert_status,
   // security_bits, ssl_connection_status), which can be used to
   // fine-tune the error message.  It is empty if the transaction
@@ skipping 58 matching lines @@
   DownloadFile* GetDownloadFile(int id);
 
   // Called only from RenameInProgressDownloadFile and
   // RenameCompletingDownloadFile on the FILE thread.
   void CancelDownloadOnRename(int id);
 
   // Erases the download file with the given the download |id| and removes
   // it from the maps.
   void EraseDownload(int id);
 
-  // Unique ID for each DownloadFile.
-  int next_id_;
-
   typedef base::hash_map<int, DownloadFile*> DownloadFileMap;
 
   // A map of all in progress downloads.  It owns the download files.
   DownloadFileMap downloads_;
 
   // Schedule periodic updates of the download progress. This timer
   // is controlled from the FILE thread, and posts updates to the UI thread.
   base::RepeatingTimer<DownloadFileManager> update_timer_;
 
   ResourceDispatcherHost* resource_dispatcher_host_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadFileManager);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_FILE_MANAGER_H_