Introducing SavePackageId and SaveItemId as distinct IdType<...>-based types.

content/content_browser.gypi

 # 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base_static',
     '../components/url_formatter/url_formatter.gyp:url_formatter',
     '../crypto/crypto.gyp:crypto',
     '../device/battery/battery.gyp:device_battery',
@@ skipping 638 matching lines @@
       'browser/download/download_stats.cc',
       'browser/download/download_stats.h',
       'browser/download/drag_download_file.cc',
       'browser/download/drag_download_file.h',
       'browser/download/drag_download_util.cc',
       'browser/download/drag_download_util.h',
       'browser/download/file_metadata_linux.cc',
       'browser/download/file_metadata_linux.h',
       'browser/download/file_metadata_mac.h',
       'browser/download/file_metadata_mac.mm',
+      'browser/download/id_type.h',
       'browser/download/mhtml_generation_manager.cc',
       'browser/download/mhtml_generation_manager.h',
       'browser/download/rate_estimator.cc',
       'browser/download/rate_estimator.h',
       'browser/download/save_file.cc',
       'browser/download/save_file.h',
       'browser/download/save_file_manager.cc',
       'browser/download/save_file_manager.h',
       'browser/download/save_file_resource_handler.cc',
       'browser/download/save_file_resource_handler.h',
@@ skipping 1547 matching lines @@
     ['enable_webvr==1 and OS=="android"', {
       'sources': [
         'browser/vr/android/cardboard/cardboard_vr_device.cc',
         'browser/vr/android/cardboard/cardboard_vr_device.h',
         'browser/vr/android/cardboard/cardboard_vr_device_provider.cc',
         'browser/vr/android/cardboard/cardboard_vr_device_provider.h',
       ],
     }],
   ],
 }