Reduce a LOG(WARNING) to a DLOG(WARNING).

net/quic/quic_connection.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/quic_connection.h"
 
 #include <string.h>
 #include <sys/types.h>
 
 #include <algorithm>
@@ skipping 811 matching lines @@
   DCHECK(connected_);
   if (debug_visitor_ != nullptr) {
     debug_visitor_->OnPingFrame(frame);
   }
   should_last_packet_instigate_acks_ = true;
   return true;
 }
 
 const char* QuicConnection::ValidateAckFrame(const QuicAckFrame& incoming_ack) {
   if (incoming_ack.largest_observed > packet_generator_.packet_number()) {
-    LOG(WARNING) << ENDPOINT << "Peer's observed unsent packet:"
-                 << incoming_ack.largest_observed << " vs "
-                 << packet_generator_.packet_number();
+    DLOG(WARNING) << ENDPOINT << "Peer's observed unsent packet:"
+                  << incoming_ack.largest_observed << " vs "
+                  << packet_generator_.packet_number();
     // We got an error for data we have not sent.  Error out.
     return "Largest observed too high.";
   }
 
   if (incoming_ack.largest_observed <
       sent_packet_manager_->GetLargestObserved(incoming_ack.path_id)) {
     LOG(WARNING) << ENDPOINT << "Peer's largest_observed packet decreased:"
                  << incoming_ack.largest_observed << " vs "
                  << sent_packet_manager_->GetLargestObserved(
                         incoming_ack.path_id)
@@ skipping 1665 matching lines @@
 // the sender and a signaling mechanism -- if the sender uses a
 // different MinRTO, we may get spurious retransmissions. May not have
 // any benefits, but if the delayed ack becomes a significant source
 // of (likely, tail) latency, then consider such a mechanism.
 const QuicTime::Delta QuicConnection::DelayedAckTime() {
   return QuicTime::Delta::FromMilliseconds(
       min(kMaxDelayedAckTimeMs, kMinRetransmissionTimeMs / 2));
 }
 
 }  // namespace net