[Signin] Move bsazonov@ to components/signin/OWNERS

Moves bsazonov@chromium.org entry from
src/components/signin/core/browser/android/OWNERS to
src/components/signin/OWNERS.

Bug: None
Change-Id: I875b291c43c316476d5ead3ccdd6d91a8ae98560
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1611597
Auto-Submit: Boris Sazonov <bsazonov@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Commit-Queue: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659447}

components/signin/OWNERS

+bsazonov@chromium.org
 droger@chromium.org
 msarda@chromium.org
 

components/signin/core/browser/android/OWNERS

-bsazonov@chromium.org
-
-# COMPONENT: Services>SignIn