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Move parsing of the 'Certificates' section of ONC to the new class
OncParsedCertificates. CertificateImporter uses this as its input.
This is a preparation for not importing policy-provided server and
authority certificates into the NSS database anymore, but only making
them available as temporary NSS certificates.

      chromeos_unittests --gtest_filter=*CertificateImporter* &&
      chromeos_unittests --gtest_filter=OncParsedCertificatesTest*

Bug: 787602
Test: unit_tests --gtest_filter=*NetworkConfigurationUpdater* &&
Change-Id: Id42f512c9b2287eb582ef3f6ade6b31f32eaf024
Reviewed-on: https://chromium-review.googlesource.com/898963Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Pavol Marko <pmarko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534719}