Move quic_bug_tracker to quic/platform. No functional change expected.

net/quic/core/congestion_control/rtt_stats.h

 // Copyright 2014 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.
 //
 // A convenience class to store rtt samples and calculate smoothed rtt.
 
 #ifndef NET_QUIC_CORE_CONGESTION_CONTROL_RTT_STATS_H_
 #define NET_QUIC_CORE_CONGESTION_CONTROL_RTT_STATS_H_
 
 #include <algorithm>
 #include <cstdint>
 
 #include "base/macros.h"
-#include "net/quic/core/quic_bug_tracker.h"
 #include "net/quic/core/quic_packets.h"
 #include "net/quic/core/quic_time.h"
+#include "net/quic/platform/api/quic_bug_tracker.h"
 #include "net/quic/platform/api/quic_export.h"
 
 namespace net {
 
 namespace test {
 class RttStatsPeer;
 }  // namespace test
 
 class QUIC_EXPORT_PRIVATE RttStats {
  public:
@@ skipping 53 matching lines @@
   // larger than the standard deviation, for a normally distributed signal.
   QuicTime::Delta mean_deviation_;
   int64_t initial_rtt_us_;
 
   DISALLOW_COPY_AND_ASSIGN(RttStats);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CORE_CONGESTION_CONTROL_RTT_STATS_H_