Revert of [Telemetry] Introduce shared_user_story_state for real. (patchset #3 id:100001 of https://codereview.chromium.org/
733303003/)
Reason for revert:
Speculative revert
BUG=435775
Original issue's description:
> [Telemetry] Introduce shared_user_story_state for real.
>
> Move page.page_runner --> user_story.user_story_runner.
>
> BUG=418278
>
> Committed: https://crrev.com/
7f4660dcd4c4476502a61eb7375c4a941d938b9b
> Cr-Commit-Position: refs/heads/master@{#305119}
TBR=chrishenry@google.com,dtu@chromium.org,tonyg@chromium.org
BUG=418278
Review URL: https://codereview.chromium.org/
752883002
Cr-Commit-Position: refs/heads/master@{#305358}