code: function(decryptionResult) {
          this._clearEvent = decryptionResult.clearEvent;
          this._senderCurve25519Key =
              decryptionResult.senderCurve25519Key || null;
          this._claimedEd25519Key =
              decryptionResult.claimedEd25519Key || null;
          this._forwardingCurve25519KeyChain =
              decryptionResult.forwardingCurve25519KeyChain || [];
      }
docs: Update the cleartext data on this event.
  
  (This is used after decrypting an event; it should not be used by applications).
  
  @internal
  
  @fires module:models/event.MatrixEvent#"Event.decrypted"
  
  @param {module:crypto~EventDecryptionResult} decryptionResult
  the decryption result, including the plaintext and some key info