A number of changes have been made to the Background Fetch API that remove certain properties from BackgroundFetchRegistration:
BackgroundFetchRegistration.icons
BackgroundFetchRegistration.title
They have been removed because the registration is now a live object, so the synchronisation in case of changes may be tough to achieve correctly. Our implementation should follow, but only once we know it's safe.
Comment 1 by bugdroid1@chromium.org
, Nov 23 2017