kmsplumberendpoint: Let parent class manage synchronization
kmsplumberendpoint: Let parent class manage synchronization

Change-Id: I6c96d2b4776804577fc1bd0d065e034636f24b59

shelsonjava/kms-elements,shelsonjava/kms-elements,TribeMedia/kms-elements,shelsonjava/kms-elements,TribeMedia/kms-elements,TribeMedia/kms-elements