This file is indexed.

/usr/share/gnome-control-center/keybindings/01-system.xml is in gnome-control-center-data 1:3.18.2-1ubuntu6.

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

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<KeyListEntries schema="org.gnome.settings-daemon.plugins.media-keys" group="system" name="System">

	<KeyListEntry name="logout" description="Log out"></KeyListEntry>

	<KeyListEntry name="screensaver" description="Lock screen"></KeyListEntry>

</KeyListEntries>