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When interacting with the sync server, HTTP errors that represent auth
errors (401) get treated as SyncerError::SYNC_AUTH_ERROR. When reporting
these cases in metric like Sync.SharingMessage.CommitResult, they should
not contribute as "Sync server error", since the nature of the problem
is different and very likely transient (i.e. expired tokens).

In follow-up patches, the actual logic to handle this situation should
be improved.

Bug: 1097054

Change-Id: I2e806fab89a49e8840324f98d68f1aadd1c40080
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2253845
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Rushan Suleymanov <rushans@google.com>
Reviewed-by: Alex Chau <alexchau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780273}