following headers are no longer used by this compilation unit: - "utils/managed_ref.hh" - "test/perf/perf.hh" this was identified by clang-include-cleaner. As the code is audited, we can safely remove the #include directive. Signed-off-by: Kefu Chai <kefu.chai@scylladb.com> Closes scylladb/scylladb#20850