/usr/share/gnome-shell/search-providers/epiphany-search-provider.ini is in epiphany-browser 3.18.5-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | [Shell Search Provider]
DesktopId=epiphany.desktop
BusName=org.gnome.EpiphanySearchProvider
ObjectPath=/org/gnome/EpiphanySearchProvider
Version=2
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