nsSlidingSharedBufferList( Buffer* aBuffer ) : nsSharedBufferList(aBuffer), mRefCount(0) { }
nsSlidingSharedBufferList( Buffer* aBuffer, nsFreeProc *aFreeproc, void *aClientData = NULL ) : nsSharedBufferList(aBuffer), mRefCount(0), mFreeProc(aFreeproc), mClientData(aClientData) { }
      nsSlidingSharedBufferList( Buffer* aBuffer ) : nsSharedBufferList(aBuffer), mRefCount(0) { }