Remove previews state usage

This can be removed as the feature is not launching.

Change-Id: I709460f82d45b9a17447fc14279adc8d2d4c53d0
Bug: 1285486
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3374256
Reviewed-by: Nicolás Peña <npm@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Charles Reis <creis@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Reviewed-by: Nate Chapin <japhet@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Ian Vollick <vollick@chromium.org>
Commit-Queue: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/main@{#960459}