GitLab

This CL is a part of moving access token management to
OAuth2AccessTokenManager. It moves APIs which access to
|token_cache_| in OAuth2AccessTokenManager to
OAuth2AccessTokenManager from OAuth2TokenService.

Bug: 967598
Change-Id: If07c87263571871ab380feb8e1be2975c2133f6a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1663932
Commit-Queue: Julie Jeongeun Kim <jkim@igalia.com>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#670045}