Remove logging of system token user certs

Remove logging added for https://crbug.com/844537 under the assumption
that the issue that the logging should help diagnose has been fixed.

Note: This is not a simple revert of CL:1169478 to keep the NULL-nullptr
clean up done there.

Bug: 844537, 915691
Test: net_unittests
Change-Id: I2b2126ae40118d6cef74ddfe95d4af751ad017a4
Reviewed-on: https://chromium-review.googlesource.com/c/1398282
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Matt Mueller <mattm@chromium.org>
Commit-Queue: Pavol Marko <pmarko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#620642}
6 files changed