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A server shouldn't be capable of returning network errors; that belongs
some other layer that represents the network. This patch moves this
support to FakeServerHttpPostProvider which is arguably an improvement
already.

Bug: 774180
Change-Id: I1e5ebae89ff82f2a1ece78555b79c9732a71ee02
Reviewed-on: https://chromium-review.googlesource.com/c/1348030
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610395}