fuchsia: Fix compilation of download_database.cc

Fuchsia is more POSIX-y than Windows-y in this instance.

Bug: 808287
Change-Id: Ie881c4136d2946c703a464e60d1b107ab4582ac8
Reviewed-on: https://chromium-review.googlesource.com/c/1298327
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Ben Hayden <benjhayden@chromium.org>
Commit-Queue: Scott Graham <scottmg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602744}
2 files changed