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Currently redirect is not supported for download in non network service
code path without a renderer where we handle the network request with
UrlDownloader.

We have two legit use cases for redirect in UrlDownloader.

1. Retry, we won't assume the renderer exists and the download URL is
the final URL.

2. Background download in normal user profile. It should be legit for
all clients to redirect.

Bug: 883387
Change-Id: Ib517b3a1e23fbfac939386c0f2341a15a54b70ab
Reviewed-on: https://chromium-review.googlesource.com/c/1312114
Commit-Queue: Xing Liu <xingliu@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604798}