Make QUIC_BAD_MULTIPATH_FLAG error log entry more informative.

net/quic/core/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/core/quic_connection.h"
 
 #include <string.h>
 #include <sys/types.h>
 
 #include <algorithm>
@@ skipping 911 matching lines @@
     const QuicConnectionCloseFrame& frame) {
   DCHECK(connected_);
   if (debug_visitor_ != nullptr) {
     debug_visitor_->OnConnectionCloseFrame(frame);
   }
   DVLOG(1) << ENDPOINT
            << "Received ConnectionClose for connection: " << connection_id()
            << ", with error: " << QuicUtils::ErrorToString(frame.error_code)
            << " (" << frame.error_details << ")";
   if (frame.error_code == QUIC_BAD_MULTIPATH_FLAG) {
-    LOG(ERROR) << " quic_version: " << version()
+    LOG(ERROR) << "Unexpected QUIC_BAD_MULTIPATH_FLAG error."
                << " last_received_header: " << last_header_
                << " encryption_level: " << encryption_level_;
   }
   TearDownLocalConnectionState(frame.error_code, frame.error_details,
                                ConnectionCloseSource::FROM_PEER);
   return connected_;
 }
 
 bool QuicConnection::OnGoAwayFrame(const QuicGoAwayFrame& frame) {
   DCHECK(connected_);
@@ skipping 1612 matching lines @@
 
 void QuicConnection::CheckIfApplicationLimited() {
   if (queued_packets_.empty() &&
       !sent_packet_manager_->HasPendingRetransmissions() &&
       !visitor_->WillingAndAbleToWrite()) {
     sent_packet_manager_->OnApplicationLimited();
   }
 }
 
 }  // namespace net