mJarCacheFile = jarCacheFile; mJARChannel = jarChannel;
    nsJARDownloadObserver(nsIFile* jarCacheFile, nsJARChannel* jarChannel,                          OnJARFileAvailableFun onJARFileAvailable,                           void* closure) {        NS_INIT_REFCNT();        mJarCacheFile = jarCacheFile;        mJARChannel = jarChannel;        NS_ADDREF(mJARChannel);    }