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If the token service has already a refresh token for the authenticated
account before this account is signed in to Chrome, then |OnRefreshToken|
notification will not be called after |GoogleSigninSucceeded|.

This CL changes the UserPolicySigninService to handle the case when the
refresh token is already present when |GoogleSigninSucceeded| is fired.

See bug for the link to the design document.

Bug: 733226
Change-Id: I17e3ef8285b4012e125951c5a38e1851a09c9c9a
Reviewed-on: https://chromium-review.googlesource.com/559538
Commit-Queue: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486008}