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Rather than converting a net::CertStatus into a net:Error,
and then back from a net::Error into a net::CertStatus,
use the original net::CertStatus passed through the layers.

For iOS, we don't use the Chrome network stack for these
loads, and so there will only ever be an NSError and not a
net::Error.

Bug: 618799
Change-Id: Ic94c2e248e74651e78cb604421dd93c6067250be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879796
Auto-Submit: Ryan Sleevi <rsleevi@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Ryan Sleevi <rsleevi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709198}