simplify methods of awc::connect::Connect trait (#1941)

actix-http/src/h1/client.rs

@@ -223,15 +223,3 @@ impl Encoder<Message<(RequestHeadType, BodySize)>> for ClientCodec {
         Ok(())
     }
 }
-
-pub struct Writer<'a>(pub &'a mut BytesMut);
-
-impl<'a> io::Write for Writer<'a> {
-    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
-        self.0.extend_from_slice(buf);
-        Ok(buf.len())
-    }
-    fn flush(&mut self) -> io::Result<()> {
-        Ok(())
-    }
-}