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When there's an Expect-CT failure, a new URLRequest will be created to
report the failure, and that request needs to have a NetworkIsolationKey
to prevent cross-site information leakage.

Bug: 969893, 1082280
Change-Id: I5daa400fed87ce23f7a9b34121888f91b9249895
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2219091
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Emily Stark <estark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773350}