nsServiceManager::ReleaseService("@mozilla.org/rdf/xul-prototype-cache;1", gXULCache);
nsServiceManager::ReleaseService("@mozilla.org/xul/xul-prototype-cache;1", gXULCache);
nsXBLStreamListener::~nsXBLStreamListener(){  /* destructor code */  gRefCnt--;  if (gRefCnt == 0) {    if (gXULUtils) {      nsServiceManager::ReleaseService("@mozilla.org/rdf/xul-content-utils;1", gXULUtils);      gXULUtils = nsnull;    }    if (gXULCache) {      nsServiceManager::ReleaseService("@mozilla.org/rdf/xul-prototype-cache;1", gXULCache);      gXULCache = nsnull;    }  }}