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This CL plumbs the network error code through to show it in the
chrome://sync-internals pages in case of NETWORK_CONNECTION_UNAVAILABLE.

This should allow for easier debugging for some user reported bugs.

Bug: 897049
Change-Id: Id0fc5455eb4d64b1a022898d8a898e7efa4a255c
Reviewed-on: https://chromium-review.googlesource.com/c/1346460
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Reviewed-by: Misha Efimov <mef@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611113}