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When NetworkService/ServiceWorkerServicification is on, MimeSniffingThrottle is
used for responses from service workers. Previously, downloading is skipped when
any of throttles handle the response, so using MimeSniffingThrottle undesirably
prevented downloading. This CL is to make downloading work properly when a
service worker serves the response.

Also, when a response is NOT served from ResourceDispatcherHost,
DownloadManagerImpl needs to be created in NavigationRequest. Currently it
happens only when NetworkService is on. This CL adds a condition where S13nSW is
on and a service worker serves the response there.

TBR=jam@chromium.org

Bug: 896696
Cq-Include-Trybots: luci.chromium.try:linux_mojo
Change-Id: I222d8148cf65d15492393ebcd6ed582deb14022f
Reviewed-on: https://chromium-review.googlesource.com/c/1290434
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601901}