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Install a fake RSA key mapped to the real subject public key info to
ARC certificate store via ARC command.
Later on the key source will be recognized by the dummy subject public
key info.

Bug: b:119914122
Test: ./unit_tests --gtest_filter=Arc*
Change-Id: I8e68bcee6c8a1c80545730e5fe2980d14021884d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1962246
Commit-Queue: Polina Bondarenko <pbond@chromium.org>
Auto-Submit: Polina Bondarenko <pbond@chromium.org>
Reviewed-by: Edman Anjos <edman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732352}