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We were already treating these responses as errors, but were using
UPDATE_OK as "ResultType" when handling the error. This fixes that
to treat these errors the same as any other non-200 server response.

Bug: 923650
Change-Id: I5f3464bd5ae8dc940f1476297cd935f9ecb5998e
Reviewed-on: https://chromium-review.googlesource.com/c/1457469
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Auto-Submit: Marijn Kruisselbrink <mek@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629869}