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The spec says the body is a NULL, so we should enforce it. Otherwise
implementations may accidentally produce certificates that get this wrong,
and then other consumers will need to mimic our laxness.

https://tools.ietf.org/html/draft-iab-protocol-maintenance-00

Bug: 851778
Change-Id: I0bcfd076d94743ab285ce0a6938182b9a32b0e36
Reviewed-on: https://chromium-review.googlesource.com/1189061
Commit-Queue: Ryan Sleevi <rsleevi@chromium.org>
Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586262}