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Replaces the two distinct implementations of CryptAuthAccessTokenFetcher with
having CryptAuthClientImpl directly construct a PAATF. Those two
implementations are each identical in functionality to using a PAATF in
kImmediate mode: the first simply wraps PAATF used in kImmediate mode, while
the second just makes an immediate request on ProfileOAuth2TokenService.

Also eliminates a //chromeos implementation of CryptAuthClientFactory, as that
implementation is now identical with the //components/cryptauth implementation,
which is used instead in the //chromeos context.

BUG=809433
R=blundell@chromium.org,khorimoto@chromium.org

Change-Id: I93ee9e736395bc71a1e741fc45d027ff32787536
Reviewed-on: https://chromium-review.googlesource.com/1107715
Commit-Queue: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Tim Song <tengs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572505}