/usr/share/pygtk/2.0/defs/gdk-types.defs is in python-gtk2-dev 2.24.0-3ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | ;; -*- scheme -*-
;; THIS FILE IS GENERATED - DO NOT EDIT
(include "gdk-base-types.defs")
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