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This CL is a part of moving access token management to
OAuth2AccessTokenManager.

It is specifically a step toward folding O2TS into PO2TS
now that O2TS is only one subclass of PO2TS.

OAuth2TokenService has been folded completely into
ProfileOAuth2TokenService on https://crrev.com/c/1712560.
So, it's not valid to comment OAuth2TokenService on the
current codebase.

This CL updates comments for OAuth2TOkenService with
IdentityManager, the access token fetcher or
OAuth2AccessTokenManager.

Bug: 967598
Change-Id: I1aba6c57d8cc65063f12be512cece3404d602fcf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1725222
Commit-Queue: Julie Jeongeun Kim <jkim@igalia.com>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682542}