This file is indexed.

/usr/share/postgresql/10/extension/pg_stat_statements--1.5--1.6.sql is in postgresql-10 10.6-0ubuntu0.18.04.1.

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

The actual contents of the file can be viewed below.

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/* contrib/pg_stat_statements/pg_stat_statements--1.5--1.6.sql */

-- complain if script is sourced in psql, rather than via ALTER EXTENSION
\echo Use "ALTER EXTENSION pg_stat_statements UPDATE TO '1.6'" to load this file. \quit

-- Execution is only allowed for superusers, fixing issue with 1.5.
REVOKE EXECUTE ON FUNCTION pg_stat_statements_reset() FROM pg_read_all_stats;