/usr/share/dbus-1/services/org.gnome.OnlineAccounts.service is in gnome-online-accounts 3.28.0-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [D-BUS Service]
Name=org.gnome.OnlineAccounts
Exec=/usr/lib/gnome-online-accounts/goa-daemon
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