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The code in //chromeos/components/drivefs runs in the browser process
on the UI thread. There aren't any plans to move it out of process.
It can directly use the C++ IdentityManager instead of using the mojo
Identity Service. This will eliminate the last client of the Identity
Service, making it easier to refactor or delete it.

Convert DriveFsAuth to use PrimaryAccountAccessTokenFetcher, which
automatically handles waiting for / getting information about the
primary account.

Migrate the tests to use IdentityTestEnvironment, specifically the
helpers for access token requests. This requires rewriting tests
that used GMock on the Identity Service mojo API, but ends up being
less code overall.

Test: rewrite the chromeos_components_unittests
Test: Google Drive still works in File Manager to read / write / copy
      files.
Bug: 1054673

Change-Id: If83be823ee2ab1936289e21b2c50451004557c17
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2063419
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Austin Tankiang <austinct@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744097}