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Add GoogleServiceAuthError to account_manager.mojom and add to- and
from- mojo conversion methods to account_manager_util.

Bug: 1140469
Change-Id: I98d71e2c5e9fd7a205d52cfb98213bab789e446e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2631502
Commit-Queue: Anastasiia N <anastasiian@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Kush Sinha <sinhak@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846010}