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While the existing policy test checks that the preference is set,
there are no end-to-end tests in //chrome/browser/ssl that makes sure
that a CTPolicyManager is created for the profile to glue into the
net::TransportSecurityState for CT overrides - making sure that the
preference actually propagates into the net::URLRequestContext.

BUG=none

Change-Id: I1296dbcf7e59aa5e9fd6e391e099d0b140463c65
Reviewed-on: https://chromium-review.googlesource.com/990152Reviewed-by: Emily Stark <estark@chromium.org>
Commit-Queue: Ryan Sleevi <rsleevi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547692}