Tracking Protection 100%: Separate the page info code

This is a refactoring without any UI changes.
Further cleanup and renaming will be done in a follow up CL.

Bug: 330745124
Change-Id: I79269db157ad7c9466ec61854472cf2f6e9c5f98
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5425991


Reviewed-by: Nicola Tommasi <tommasin@chromium.org>
Commit-Queue: Andrey Zaytsev <andzaytsev@google.com>
Cr-Commit-Position: refs/heads/main@{#1283902}