[live-preview] Unittest for PageInfoPermissionContentView

Bug: b:331699516
Change-Id: Ie438f5cc9c03070da1aaf523597fe142b08a2693
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5405705


Commit-Queue: Ahmed Moussa <ahmedmoussa@google.com>
Reviewed-by: Emily Stark <estark@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1282752}