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On certain Android devices, when disconnecting from WIFI, the network
code will report NETWORK_TIMEOUT before NETWORK_DISCONNECT and trigger
auto download resumption. And we erase the data downloaded by parallel
requests, so the download percentage will go backwards.

Instead, we should keep the slice info when resume with an error.

Bug: 837128
Change-Id: I002c69ac4d5e1c33133e4dbddd44c3c5173a494e
Reviewed-on: https://chromium-review.googlesource.com/1112754Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571286}