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This CL is a second step towards reorganizing //components/signin java files, this one moves the files from core/browser/android to public/android when relevant.

Bug: 934688
Change-Id: I0ac30a3d94fa0a09f645b70c1ddc6c5345b94441
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1814826Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Commit-Queue: Pâris Meuleman <pmeuleman@chromium.org>
Auto-Submit: Pâris Meuleman <pmeuleman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762795}