[PageInfo] Use new subtitle strings in Page Info.

This is a fix to the bug linked, it is similar to https://crrev/c/5661016 where the string content was the same but the name of the string was different, causing crashes/weirdness.

Bug: b:358468709
Change-Id: I03f5898ace8335c60cc1bd32221157aabd842cd4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5888009
Reviewed-by: Elly FJ <ellyjones@chromium.org>
Commit-Queue: Michelle Abreo <michelleabreo@google.com>
Auto-Submit: Michelle Abreo <michelleabreo@google.com>
Reviewed-by: Fiona Macintosh <fmacintosh@google.com>
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1359918}