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This CL makes the FILE_DOWNLOADED Connector replace
CheckContentCompliance and SendFilesForMalwareCheck on downloads. This
is achieved by replacing CheckClientDownloadRequest::ShouldUploadBinary
by CheckClientDownloadRequest::GetAnalysisSettings and passing the
returned settings as a parameter to DeepScanningRequest when they are
found.

This CL does not introduce new tests since this refactor should not
affect the behaviour of the previous legacy policies. Once this is
submitted, further CLs will reuse download tests with the
FILE_DOWNLOADED connector (crbug/1076083).

Bug: 1067631
Change-Id: Id66c37b64280f1e482043b8223a72dfd41017147
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2191205Reviewed-by: Daniel Rubery <drubery@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Commit-Queue: Dominique Fauteux-Chapleau <domfc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771555}