Merge from Widevine repo of http://go/wvgerrit/127246
The unit tests WvGenericCryptoTest expected an error code to be
returned from SelectKey. But we allow an invalid key to be signaled
either at SelectKey or later when the decrypt operation occurs.
This CL just updates the tests.
Bug: 190745519
Test: ran tests on bonito
Change-Id: Ibacc92d6a6e708f2f104cb549b5845335f6c8cf5