Modern macOS has no problem unzipping big zip files. To test:

$ gsutil cp gs://chromium-git-cache/chromium.googlesource.com-chromium-src/516491.zip test.zip
$ unzip -l test.zip

Change-Id: I84b3cff21cb9b7033c04b427e23f27a75ab1d8ae
Reviewed-on: https://chromium-review.googlesource.com/1152294
Commit-Queue: Jeremy Apthorp <jeremya@chromium.org>
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>