TP: Fix ZipReader tests when zlib is disabled. Fix chromium.
TP: Fix ZipReader tests when zlib is disabled. Fix chromium.

Some chromium tests build without zlib. Tests were failing.
See https://chromium-review.googlesource.com/c/chromium/src/+/3787328/

Test: manual, run ZipReader tests with zlib disabled in GN
Change-Id: Ifbb83ec32246709656e44b9c6f31b32d003ddedd
google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto