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SigninManager::Observer::GoogleSigninSucceeded 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: I5e2d56187b60e0a84dc6c3b6fae100f7b1d0467f
Reviewed-on: https://chromium-review.googlesource.com/c/1344052
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610040}