Re-enable the CertificateType2 histograms
Re-enable the CertificateType2 histograms

They were inappropriately flagged as unowned, despite me indicating that
I owned them.

BUG=none

Review-Url: https://codereview.chromium.org/1996453002
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#394798}

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