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This was done in https://codereview.chromium.org/2862563004/ but this was reverted.
In this version the finch is created, but not enabled. It will be enabled in a subsequent CL once the issues that caused it to be reverted have been fixed.

TEST= sbox_integration_tests.exe, *

Bug: 464430
Change-Id: Ie7fd8e9f8e867929028f414af0b0c7886809b720
Reviewed-on: https://chromium-review.googlesource.com/567272Reviewed-by: Penny MacNeil <pennymac@chromium.org>
Commit-Queue: Liam Murphy <liamjm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486029}