Initialize net::TransportSecurityState::expect_ct_reporter_
Initialize net::TransportSecurityState::expect_ct_reporter_

This was left out of https://codereview.chromium.org/1579063002/

BUG=
TBR=eroman@chromium.org

Review URL: https://codereview.chromium.org/1780153002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#380380}

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