NativeIO: Fix quota reporting in Incognito.

Bug: 1289881
Change-Id: I6412db96ddd56c6e2156275702b7b6a887e491d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3408197


Commit-Queue: Victor Costan <pwnall@chromium.org>
Auto-Submit: Victor Costan <pwnall@chromium.org>
Reviewed-by: Ayu Ishii <ayui@chromium.org>
Commit-Queue: Ayu Ishii <ayui@chromium.org>
Cr-Commit-Position: refs/heads/main@{#962216}