It turns out Google Chrome (via Chromium) includes a default extension which makes extra services available to code running on the `*.google.com` domains - tweeted about today [by Luca Casonato](https://twitter.com/lcasdev/status/1810696257137959018), …
This comes from
hangout_services/thunk.jsI searched for
hangoutin the vanadium repo, no result, so it’s not patched there either: https://github.com/GrapheneOS/Vanadium