Quota: remove code for quotachange event/Storage Pressure API.
The flag was not enabled, so there should be no behavioral change.
Bug: 4027659
Change-Id: I1a323a45d97b661a574f046a61954397439d48a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5930607
Commit-Queue: Evan Stade estade@chromium.org
Reviewed-by: Daniel Cheng dcheng@chromium.org
Reviewed-by: Ayu Ishii ayui@chromium.org
Reviewed-by: Dmitry Gozman dgozman@chromium.org
Reviewed-by: Stephen White senorblanco@chromium.org
Reviewed-by: Greg Thompson grt@chromium.org
Cr-Commit-Position: refs/heads/main@{#1370046}