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

content/content_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': 'content_browser',
       'type': 'static_library',
       'dependencies': [
@@ skipping 95 matching lines @@
         'browser/disposition_utils.cc',
         'browser/disposition_utils.h',
         'browser/download/base_file.cc',
         'browser/download/base_file.h',
         'browser/download/download_create_info.cc',
         'browser/download/download_create_info.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_id.cc',
+        'browser/download/download_id.h',
         'browser/download/download_item.cc',
         'browser/download/download_item.h',
         'browser/download/download_manager.cc',
         'browser/download/download_manager.h',
         'browser/download/download_manager_delegate.h',
         'browser/download/download_persistent_store_info.cc',
         'browser/download/download_persistent_store_info.h',
         'browser/download/download_request_handle.cc',
         'browser/download/download_request_handle.h',
         'browser/download/download_resource_handler.cc',
@@ skipping 439 matching lines @@
           },
         }, { # OS!="mac"
           'dependencies': [
             '../sandbox/sandbox.gyp:sandbox',
           ],
         }],
       ],
     },
   ],
 }