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

net/quic/core/quic_stream.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_stream.h"
 
 #include "base/logging.h"
-#include "net/quic/core/quic_bug_tracker.h"
 #include "net/quic/core/quic_flags.h"
 #include "net/quic/core/quic_flow_controller.h"
 #include "net/quic/core/quic_session.h"
 #include "net/quic/core/quic_write_blocked_list.h"
+#include "net/quic/platform/api/quic_bug_tracker.h"
 
 using base::StringPiece;
 using std::string;
 
 namespace net {
 
 #define ENDPOINT \
   (perspective_ == Perspective::IS_SERVER ? "Server: " : "Client: ")
 
 namespace {
@@ skipping 450 matching lines @@
   }
 }
 
 void QuicStream::UpdateSendWindowOffset(QuicStreamOffset new_window) {
   if (flow_controller_.UpdateSendWindowOffset(new_window)) {
     OnCanWrite();
   }
 }
 
 }  // namespace net