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

net/quic/core/quic_multipath_received_packet_manager.cc

 // Copyright (c) 2015 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_multipath_received_packet_manager.h"
 
 #include <cstdint>
 
 #include "base/memory/ptr_util.h"
-#include "net/quic/core/quic_bug_tracker.h"
+#include "net/quic/platform/api/quic_bug_tracker.h"
 
 namespace net {
 
 QuicMultipathReceivedPacketManager::QuicMultipathReceivedPacketManager(
     QuicConnectionStats* stats) {
   path_managers_[kDefaultPathId] =
       base::MakeUnique<QuicReceivedPacketManager>(stats);
 }
 
 QuicMultipathReceivedPacketManager::~QuicMultipathReceivedPacketManager() {}
@@ skipping 87 matching lines @@
   if (manager == nullptr) {
     QUIC_BUG
         << "Try to get peer_least_packet_awaiting_ack of a non-existent path.";
     return false;
   }
 
   return manager->peer_least_packet_awaiting_ack();
 }
 
 }  // namespace net