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Add Observer to net::CertDatabase in certificate_manager_model CertsSourcePlatformNSS to observe the changes in the CertDatabase and Refresh whenever there is a change in the database to solve the bug. Update the tests accordingly.

Bug: 1146607
Change-Id: I3b9ba7f64cf47333cb79430c6a060620290e8f30
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2601748Reviewed-by: Matt Mueller <mattm@chromium.org>
Reviewed-by: Pavol Marko <pmarko@chromium.org>
Commit-Queue: Irem Uğuz <iremuguz@google.com>
Cr-Commit-Position: refs/heads/master@{#843463}