This file is indexed.

/usr/share/lightdm/lightdm.conf.d/40-lightdm-webkit-greeter.conf is in lightdm-webkit-greeter 0.1.2-0ubuntu4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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[Seat:*]
greeter-session=lightdm-webkit-greeter