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Add a mojo parameter to use the built-in cert verifier on Chrome OS.
Pass a SystemTrustStoreProvider to CertVerifyProcBuiltin on ChromeOS
which will provide SystemTrustStores that filter trusted certificates
based on the NSS slot.

Bug: 939344, 978069
Test: browser_tests --gtest_filter=SSLUITestCustomCACerts*
Change-Id: I6b3cb864098f6f802c14092871e295b2576e7cde
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1676170
Commit-Queue: Pavol Marko <pmarko@chromium.org>
Reviewed-by: Matt Mueller <mattm@chromium.org>
Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676156}