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SigninManager::Observer::GoogleSignedOut had two overload one
taking a AccountInfo, and one taking two std::string. The latter
is deprecated in favor of the former.

As all overrides of the latter version are in components/signin
or services/identity, convert them in one CL and remove the old
method (that is now unused).

Bug: none
Change-Id: I1e65e9d182f7e48e75ed86f43647a57f65bf3d0e
Reviewed-on: https://chromium-review.googlesource.com/c/1344094
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610384}