[Native File System] Show page info entry also if site is only reading files.

This lets a user block access to a site without having to first grant the site
write access.

Bug: 990989
Change-Id: Icd2d138f00b69d5435918e98c2d5edc11e090f36
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1736114
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Auto-Submit: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684543}
5 files changed