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This logic is present in ResourceDispatcherHostImpl::ContinuePendingBeginRequest().
However, it is missing in URLLoader when constructing the URLRequest.
The bug causes the wrong cookie to be presented if server redirection happens.
DownloadContentTest.DownloadAttributeSameSiteCookie should provide test coverage for this CL.

BUG=787046

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: I708ecba1c386d101ae21e968351732a15fb6f31f
Reviewed-on: https://chromium-review.googlesource.com/779065Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#518367}