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

net/quic/core/quic_multipath_sent_packet_manager.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_multipath_sent_packet_manager.h"
 
 #include <cstdint>
 
-#include "net/quic/core/quic_bug_tracker.h"
+#include "net/quic/platform/api/quic_bug_tracker.h"
 #include "net/quic/platform/api/quic_str_cat.h"
 
 using std::string;
 
 namespace net {
 
 QuicMultipathSentPacketManager::QuicMultipathSentPacketManager(
     QuicSentPacketManagerInterface* manager,
     QuicConnectionCloseDelegateInterface* delegate)
     : delegate_(delegate) {
@@ skipping 506 matching lines @@
     const {
   QuicSentPacketManagerInterface* path_manager =
       MaybeGetSentPacketManagerForActivePath(kDefaultPathId);
   if (path_manager == nullptr) {
     return nullptr;
   }
   return path_manager->GetSendAlgorithm();
 }
 
 }  // namespace net