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This avoids distributing STHs and SCTs to it and spending time verifying STH signatures
when they won't be used for anything.

Bug: 828665
Change-Id: I8cb6b67fcd12d9e4f875331d1eae9c44d9e74925
Reviewed-on: https://chromium-review.googlesource.com/1009913Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
Commit-Queue: Rob Percival <robpercival@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550675}