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Wrap OAuth2TokenService GetAccessToken, InvalidateToken,
GetNewAccessToken in IdentityManager and use it in dependencies. This is
a step of the layering of Signin and Identity in Android and a precursor
to the internalization of Oauth2tokenservice.

details here:
https://docs.google.com/document/d/1_ks5kg3qr6TVq7NT6MFg6lh5Yiv-1lic6Rsd9nu5ubI


Bug: 934688
Change-Id: Idf7cde0546a32fe815f87ae3cea95cd092edfa79
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1764128
Auto-Submit: Pâris Meuleman <pmeuleman@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Tatiana Gornak <melandory@chromium.org>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Tatiana Gornak <melandory@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712973}