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This moves clients of SigninManager.isSignedOnNative to
IdentityManager.hasPrimaryAccount.

Bug: 934688
Change-Id: Ifbcc4c5647f4d2ea1dfd4197e35e136cf1d94fd5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1742346Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Pâris Meuleman <pmeuleman@chromium.org>
Auto-Submit: Pâris Meuleman <pmeuleman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694793}