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The reason we're now splitting this module into its own target is
to avoid dependency cycles when migrating certain bits to the
Identity service: since AuthService lives in google_apis/drive,
we can't port it to the IdentityManager without incurring in a
cycle caused by the identity service depending on the signin
component which, in turn, depends again on google_apis.

Note that we now need to make some GN targets under chrome/browser
directly depend on //google_apis/drive as well in order to prevent
build failures caused from happening because of such targets including
headers files from //google_apis/drive. This was not required before
doing this split since those targets would implicitly pull //google_apis
through some of their direct dependencies' public_deps anyway. However,
the new //google_apis/drive target is not listed as a public_dep anywhere,
and so explicitly depending on it from those places is now required.

Making this change now allows us to break the cycle since the signin
component does not depend on anything in google_apis/drive, allowing
us to reimplement AuthService in terms of the IdentityManager.

Bug: 809440
Change-Id: Iec117d39beb073a094c180a1d855b7f33353e0b2
Reviewed-on: https://chromium-review.googlesource.com/c/1273074
Commit-Queue: Mario Sanchez Prada <mario@igalia.com>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600749}