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Add requiredKeyPairs ARC policy that contains certificate names for the
smart card certificates, available to ARC.

This policy is needed to be able to remove smart cards from the list
once the reader is detached.

The list is updated after the ArcSmartCardManagerBridge::Refresh is called.

Bug: b:119914122
Test: ./out/Debug/unit_tests --gtest_filter=ArcSmartCardManagerBridgeTest*
Test: ./out/Debug/unit_tests --gtest_filter=ArcPolicyBridgeRequiredKeyPairTest*
Test: ./out/Debug/browser_tests --gtest_filter=Arc*
Test: detach a smart card reader from the local device, make sure that there is no \
      certificate shown in a client certificate user dialog launched from the test \
      Android app.

Change-Id: I524929ac25d67edaaf54eecdd61448a060393c00
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1724083
Commit-Queue: Polina Bondarenko <pbond@chromium.org>
Auto-Submit: Polina Bondarenko <pbond@chromium.org>
Reviewed-by: Bartosz Fabianowski <bartfab@chromium.org>
Reviewed-by: Edman Anjos <edman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695977}