Roll zlib to fix a warning on Mac BUG= Change-Id: Iaef87582aba57632d5a696fdf9ff09c4fab5c75a Reviewed-on: https://chromium-review.googlesource.com/483619 Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Corentin Wallez <cwallez@chromium.org>