Another attempt to properly initialize net::TestURLRequestContext::ct_policy_enforcer_.
Another attempt to properly initialize net::TestURLRequestContext::ct_policy_enforcer_.

r380368 was not enough, as there are two ctors.

TBR=estark@chromium.org

Review URL: https://codereview.chromium.org/1772343006

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#380396}

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