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

chrome/chrome_browser.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'dependencies': [
@@ skipping 835 matching lines @@
         'browser/download/download_extensions.cc',
         'browser/download/download_extensions.h',
         'browser/download/download_file.cc',
         'browser/download/download_file.h',
         'browser/download/download_file_manager.cc',
         'browser/download/download_file_manager.h',
         'browser/download/download_file_picker.cc',
         'browser/download/download_file_picker.h',
         'browser/download/download_history.cc',
         'browser/download/download_history.h',
+        'browser/download/download_id.cc',
+        'browser/download/download_id.h',
         'browser/download/download_item.cc',
         'browser/download/download_item.h',
         'browser/download/download_item_model.cc',
         'browser/download/download_item_model.h',
         'browser/download/download_manager.cc',
         'browser/download/download_manager.h',
         'browser/download/download_manager_delegate.h',
         'browser/download/download_prefs.cc',
         'browser/download/download_prefs.h',
         'browser/download/download_request_handle.cc',
@@ skipping 4033 matching lines @@
       ],
       'export_dependent_settings': [
         'in_memory_url_index_cache_proto',
       ],
       # This target exports a hard dependency because it includes generated
       # header files.
       'hard_dependency': 1,
     },
   ],
 }