GitLab

For origins with unlimitedStorage permission, the Quota system will now return
available disk space + usage by origin as the quota for that origin.

Change-Id: Ic49b0488c35c0396fbfc1754da2fba063f38452e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1736002
Commit-Queue: Jarryd Goodman <jarrydg@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684168}