Remove Sub-Licenses and Sub-Sessions

(This is a merge of http://go/wvgerrit/66643)

The sub-license feature has been removed from the server and packager.
So that we do not have to continue maintaining the code that supports
this feature that never shipped, I am removing it from the CDM as well.

Bug: 113165466
Test: CE CDM Unit Tests
Test: Android Unit Tests
Change-Id: I5d25844b161e74aa19adf19a29c56e4881aa7304

libwvdrmengine/cdm/core/include/crypto_session.h

@@ -199,13 +199,6 @@ class CryptoSession {
                                            bool* can_support_cgms_a);
   virtual metrics::CryptoMetrics* GetCryptoMetrics() { return metrics_; }
 
-  virtual CdmResponseType AddSubSession(const std::string& sub_session_key_id,
-                                        const std::string& group_master_key_id);
-  // TODO(jfore): exists is set based on whether a sub session exists. For now,
-  // that is not assumed to be an error.
-  virtual bool GenerateSubSessionNonce(const std::string& sub_session_key_id,
-                                       bool* exists, uint32_t* nonce);
-
   virtual CdmResponseType GetProvisioningMethod(
       SecurityLevel requested_security_level,
       CdmClientTokenType* token_type);
@@ -295,9 +288,6 @@ class CryptoSession {
   std::string oem_token_;  // Cached OEMCrypto Public Key
   bool update_usage_table_after_close_session_;
   CryptoSessionId oec_session_id_;
-  SubLicenseSessionMap sub_license_oec_sessions_;
-  // Used for sub license sessions.
-  std::string wrapped_key_;
   std::unique_ptr<KeySession> key_session_;
 
   OEMCryptoBufferType destination_buffer_type_;