Print Preview: Update some data/ files to class-based syntax

Specifically updating:
- document_info.js
- state.js
- user_manager.js

Bug: 1206112
Change-Id: If125fed63832266131d743c8ab68322278922d83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3057795


Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#906343}