Let me take over this bug.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a0b12748b8f7c9bf3f6cbab89d6bd903c92ed406

commit a0b12748b8f7c9bf3f6cbab89d6bd903c92ed406
Author: Gyuyoung Kim <gyuyoung@igalia.com>
Date: Fri Jan 18 09:59:55 2019

s13n: Eliminate per_user_topic_registration_request.h's include of oauth2_token_service.h

Clean up oauth2-token-service-related code in per_user_topic_registration_request.h
because there are no uses of OAuth2TokenService.

Bug:  921614 
Change-Id: If8e010843984cc5c70f5aa96be1c576081a78b9f
Reviewed-on: https://chromium-review.googlesource.com/c/1414250
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624052}
[modify] https://crrev.com/a0b12748b8f7c9bf3f6cbab89d6bd903c92ed406/components/invalidation/impl/per_user_topic_registration_request.h