The following ChromeOS files use NetworkChangeNotifier, and will need to be migrated over to NetworkConnectionTracker:

https://cs.chromium.org/chromium/src/chrome/browser/chromeos/crostini/crostini_manager.cc
https://cs.chromium.org/chromium/src/chrome/browser/chromeos/drive/file_system_util.cc
https://cs.chromium.org/chromium/src/chrome/browser/chromeos/login/app_launch_controller.cc
https://cs.chromium.org/chromium/src/chromeos/components/drivefs/drivefs_host.cc
https://cs.chromium.org/chromium/src/chrome/browser/chromeos/login/session/user_session_manager.cc
https://cs.chromium.org/chromium/src/chrome/browser/chromeos/login/signin/merge_session_throttling_utils.cc
https://cs.chromium.org/chromium/src/chrome/browser/chromeos/login/demo_mode/demo_session.cc
https://cs.chromium.org/chromium/src/chrome/browser/chromeos/extensions/file_manager/private_api_drive.cc