/usr/share/postgresql/9.3/extension/timetravel--unpackaged--1.0.sql is in postgresql-contrib-9.3 9.3.24-0ubuntu0.14.04.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | /* contrib/spi/timetravel--unpackaged--1.0.sql */
-- complain if script is sourced in psql, rather than via CREATE EXTENSION
\echo Use "CREATE EXTENSION timetravel FROM unpackaged" to load this file. \quit
ALTER EXTENSION timetravel ADD function timetravel();
ALTER EXTENSION timetravel ADD function set_timetravel(name,integer);
ALTER EXTENSION timetravel ADD function get_timetravel(name);
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