Implement unprefixed EME APIs that match the latest draft

Source/modules/encryptedmedia/MediaKeySession.cpp

 /*
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 587 matching lines @@
         errorCode = MediaKeyErrorCodeClient;
         break;
     default:
         // All other exceptions get converted into Unknown.
         errorCode = MediaKeyErrorCodeUnknown;
         break;
     }
     error(errorCode, systemCode);
 }
 
+void MediaKeySession::expirationChanged(double updatedExpiryTimeInMS)
+{
+    // FIXME: Implement expiration attribute.
+}
+
 const AtomicString& MediaKeySession::interfaceName() const
 {
     return EventTargetNames::MediaKeySession;
 }
 
 ExecutionContext* MediaKeySession::executionContext() const
 {
     return ActiveDOMObject::executionContext();
 }
 
@@ skipping 29 matching lines @@
 {
     visitor->trace(m_error);
     visitor->trace(m_asyncEventQueue);
     visitor->trace(m_pendingActions);
     visitor->trace(m_mediaKeys);
     visitor->trace(m_closedPromise);
     EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace blink