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This removes the dependency on OAuth2TokenService from AuthService,
adapting all the clients of such API across the board, that is:

  - Private files from chrome/browser/chromeos/extensions/file_manager
  - drive::DriveAPIService (components/drive/service/drive_api_service.*)

Likewise, in order to keep chromium building and tests passing, this
changeset also updates the few clients of DriveAPIService in order to
pass an IdentityManager from now on, instead of an OAuth2TokenService:

  - //c/b/chromeos/drive/drive_integration_service.cc
  - //c/b/sync_file_system/drive_backend/sync_engine.*
  - //c/b/apps/platform_apps/api/sync_file_system/sync_file_system_browsertest.cc

...where //c/b stands for //chrome/browser.

Bug: 809440
Change-Id: I0c5691bcd2e86e8b0e7bca2f27fa42e2edc59a84
Reviewed-on: https://chromium-review.googlesource.com/c/1288571Reviewed-by: Taiju Tsuiki <tzik@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Commit-Queue: Mario Sanchez Prada <mario@igalia.com>
Cr-Commit-Position: refs/heads/master@{#602372}