Merge from widevine repo of http:/go/wvgerrit/14707 This CL adds a check to oemcrypto_test to verify that when a certificate is rewrapped, it does not show up in the clear. We can't really verify that it is encrypted well, but we can check this. bug: 21871738 Change-Id: I07c87c38a1e2a099a90a5be4e3350e91e09f6722