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Some cases in the KioskAppManagerBrowsertest are flaky because
SimpleURLLoaderImpl::OnReceiveResponse may get non-500 failure response
code. I suspect they are actually 400 error, but don't have enough
evidence.

Add some additional logic to log this information to figure out the root
cause.

Bug: 1090937
Change-Id: Ia343519dbd06311dfde2bccd25d9ebf86bb72566
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2257857Reviewed-by: David Bertoni <dbertoni@chromium.org>
Commit-Queue: Anqing Zhao <anqing@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781510}