RATIS-1968. Remove unreached else block of trySendDelayed

Author: symious

ratis-common/src/main/java/org/apache/ratis/util/SlidingWindow.java

@@ -356,20 +356,11 @@ public synchronized void receiveReply(
     }
 
     private void trySendDelayed(Consumer<REQUEST> sendMethod) {
+      // We check "firstReplied" in case receiving unexpected replies.
       if (firstReplied) {
         // after first received, all other requests can be submitted (out-of-order)
         delayedRequests.getAllAndClear().forEach(
             seqNum -> sendMethod.accept(requests.getNonRepliedRequest(seqNum, "trySendDelayed")));
-      } else {
-        // Otherwise, submit the first only if it is a delayed request
-        final Iterator<REQUEST> i = requests.iterator();
-        if (i.hasNext()) {
-          final REQUEST r = i.next();
-          final Long delayed = delayedRequests.remove(r.getSeqNum());
-          if (delayed != null) {
-            sendOrDelayRequest(r, sendMethod);
-          }
-        }
       }
     }