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We should probably not have these requests follow cross-origin redirects
anyways, but in the off case they do redirect to the original site, they
should not be sending SameSite cookies to it.

Fixed: 1070232
Bug: 1060631
Change-Id: Id1e5b700c779f7b20aeba9bd372178aeb83c755f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2147924
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Dominic Farolino <dom@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758967}