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In order to make a reasonable decision about the reasonable-sounding
feature request in https://crbug.com/835465, this patch starts processing
XFO headers on redirect responses in order to collect metrics about how
many requests we'd impact by tightening our enforcement.

Bug: 835465
Change-Id: Ieb4571aae10e31fb61f1ccc245da5eb5dab791ae
Reviewed-on: https://chromium-review.googlesource.com/1023393
Commit-Queue: Mike West <mkwst@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553520}