Remove support for QUIC_VERSION_16.

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>
 #include <iterator>
@@ skipping 1531 matching lines @@
 void QuicConnection::UpdateStopWaiting(QuicStopWaitingFrame* stop_waiting) {
   stop_waiting->least_unacked = GetLeastUnacked();
   stop_waiting->entropy_hash = sent_entropy_manager_.GetCumulativeEntropy(
       stop_waiting->least_unacked - 1);
 }
 
 void QuicConnection::SendPing() {
   if (retransmission_alarm_->IsSet()) {
     return;
   }
-  if (version() == QUIC_VERSION_16) {
-    // TODO(rch): remove this when we remove version 15 and 16.
-    // This is a horrible hideous hack which we should not support.
-    IOVector data;
-    char c_data[] = "C";
-    data.Append(c_data, 1);
-    QuicConsumedData consumed_data =
-        packet_generator_.ConsumeData(kCryptoStreamId, data, 0, false,
-                                      MAY_FEC_PROTECT, NULL);
-    if (consumed_data.bytes_consumed == 0) {
-      DLOG(ERROR) << "Unable to send ping!?";
-    }
-  } else {
-    packet_generator_.AddControlFrame(QuicFrame(new QuicPingFrame));
-  }
+  packet_generator_.AddControlFrame(QuicFrame(new QuicPingFrame));
 }
 
 void QuicConnection::SendAck() {
   ack_alarm_->Cancel();
   stop_waiting_count_ = 0;
   num_packets_received_since_last_ack_sent_ = 0;
   bool send_feedback = false;
 
   // Deprecating the Congestion Feedback Frame after QUIC_VERSION_22.
   if (version() <= QUIC_VERSION_22) {
@@ skipping 444 matching lines @@
   }
   for (size_t i = 0; i < retransmittable_frames->frames().size(); ++i) {
     if (retransmittable_frames->frames()[i].type == CONNECTION_CLOSE_FRAME) {
       return true;
     }
   }
   return false;
 }
 
 }  // namespace net