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This CL starts to add security check for download without renderer in
non network service code path.

The security hook is in content, so we may need to introduce some
content dependency on network service code path as well. The in memory
download backend of background download may have the same issue. These
scenarios will be addressed in following up CLs.

Bug: 883387
Change-Id: I02001fe97a54960903f26d0e5376f2a8b46e2db6
Reviewed-on: https://chromium-review.googlesource.com/c/1318840Reviewed-by: Min Qin <qinmin@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605868}