Revert "fix(http1): fix rare missed write wakeup on connections (#974)"

This reverts commit d6bccef.

Author: 0x676e67

src/core/client/proto/h1/dispatch.rs

@@ -136,13 +136,7 @@ where
         for _ in 0..16 {
             let _ = self.poll_read(cx)?;
             let _ = self.poll_write(cx)?;
-            let conn_ready = self.poll_flush(cx)?.is_ready();
-
-            // If we can write more body and the connection is ready, we should
-            // write again. If we return `Ready(Ok(())` here, we will yield
-            // without a guaranteed wakeup from the write side of the connection.
-            // This would lead to a deadlock if we also don't expect reads.
-            let wants_write_again = self.body_rx.is_some() && conn_ready;
+            let _ = self.poll_flush(cx)?;
 
             // This could happen if reading paused before blocking on IO,
             // such as getting to the end of a framed message, but then
@@ -152,11 +146,7 @@ where
             //
             // Using this instead of task::current() and notify() inside
             // the Conn is noticeably faster in pipelined benchmarks.
-            let wants_read_again = self.conn.wants_read_again();
-
-            // If we cannot write or read again, we yield and rely on the
-            // wakeup from the connection futures.
-            if !(wants_write_again || wants_read_again) {
+            if !self.conn.wants_read_again() {
                 //break;
                 return Poll::Ready(Ok(()));
             }