const nsACString &contentType    = EmptyCString())
const nsACString &contentType, const nsACString *contentCharset)
NS_NewInputStreamChannel(nsIChannel      **result,                         nsIURI           *uri,                         nsIInputStream   *stream,                         const nsACString &contentType    = EmptyCString()){    return NS_NewInputStreamChannel(result, uri, stream, contentType, nsnull);}