Merge from Widevine repo of http://go/wvgerrit/57720 Now that we have oemcrypto mock split into reference and testbed code, it is time to remove the part of testbed that is an exact copy of the reference code and just use the reference code. Test: unit tests Bug: 76393338 Change-Id: I3831a3f0118221c21ff1c28e6b6101b27b889012