/usr/share/xserver-xorg/xinputdep is in xserver-xorg-dev-lts-xenial 2:1.18.3-1ubuntu2.3~trusty4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | xorg-input-abi-22, xserver-xorg-core-lts-xenial (>= 2:1.17.99.902)
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