/usr/share/p11-kit/modules/gnome-keyring.module is in libp11-kit-gnome-keyring 3.18.3-0ubuntu2.
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 6 | # The file is installed/loaded from the default module p11-kit directory
module: gnome-keyring-pkcs11.so
# And where to store and lookup trust objects
x-trust-store: pkcs11:library-manufacturer=GNOME%20Keyring;serial=1:XDG:DEFAULT
x-trust-lookup: pkcs11:library-manufacturer=GNOME%20Keyring
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