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When network service is enabled by default, page transition type is
not propagated to download when intercepting a navigation. This
CL fixes the issue by sending the transition type from
NavigationRequest, and also fixes an issue that we only check for
DownloadItem::HasUserGesture() when new download backend is enabled.

BUG=1014451

Change-Id: Ie3d7614fbfc007a221c86125ac124087ac09a75d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879612Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709176}