This is a merge of http://go/wvgerrit/13751 from the widevine
repository.
The CryptoSession had an enumeration for HDCP levels that was copied
from OEMCryptoCENC.h by hand. Since that header is included, there is
no need to have two enumerations.
b/16303994
Change-Id: Ief16ba62163776f9ca80375f3638ef4c7770e742