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The main purpose here is the refactoring of the almost identical
RegisterAndFetchPolicyBeforeSignIn and isUserManager. This brought some
simplification on the java code, with the removal of the native call to
ShouldLoadPolicyForUser.

Bug: 963400
Change-Id: I828f9a328bc153ebc6325f194fb34206bbe40e9a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1628721
Commit-Queue: Pâris Meuleman <pmeuleman@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666337}