Fix all Performance and Bug-Prone patterns in quic/core. No functional change. Not flag protected.

net/quic/core/quic_sent_packet_manager.cc

 // Copyright 2013 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_sent_packet_manager.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/logging.h"
@@ skipping 687 matching lines @@
   return RTO_MODE;
 }
 
 void QuicSentPacketManager::InvokeLossDetection(QuicTime time) {
   if (FLAGS_quic_loss_recovery_use_largest_acked && !packets_acked_.empty()) {
     DCHECK_LE(packets_acked_.front().first, packets_acked_.back().first);
     largest_newly_acked_ = packets_acked_.back().first;
   }
   loss_algorithm_->DetectLosses(unacked_packets_, time, rtt_stats_,
                                 largest_newly_acked_, &packets_lost_);
-  for (const pair<QuicPacketNumber, QuicByteCount>& pair : packets_lost_) {
+  for (const auto& pair : packets_lost_) {
     ++stats_->packets_lost;
     if (debug_delegate_ != nullptr) {
       debug_delegate_->OnPacketLoss(pair.first, LOSS_RETRANSMISSION, time);
     }
 
     // TODO(ianswett): This could be optimized.
     if (unacked_packets_.HasRetransmittableFrames(pair.first)) {
       MarkForRetransmission(pair.first, LOSS_RETRANSMISSION);
     } else {
       // Since we will not retransmit this, we need to remove it from
@@ skipping 278 matching lines @@
 
 void QuicSentPacketManager::RemoveObsoletePackets() {
   unacked_packets_.RemoveObsoletePackets();
 }
 
 void QuicSentPacketManager::OnApplicationLimited() {
   send_algorithm_->OnApplicationLimited(unacked_packets_.bytes_in_flight());
 }
 
 }  // namespace net