/usr/share/live/build/hooks/009-remove-apt-sources-lists.chroot is in live-build 3.0~a57-1ubuntu34.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | #!/bin/sh
set -e
# Remove apt sources.list files
rm -f /etc/apt/sources.list
rm -f /etc/apt/sources.list~
rm -f /etc/apt/sources.list.d/*.list
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