Split xfa_document_serialize into class files

xfa/fxfa/app/xfa_ffdoc.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "xfa/fxfa/include/xfa_ffdoc.h"
 
 #include <algorithm>
 
 #include "core/fpdfapi/fpdf_parser/include/cpdf_array.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_document.h"
 #include "core/fpdfdoc/include/fpdf_doc.h"
 #include "core/fxcrt/include/fx_ext.h"
 #include "core/fxcrt/include/fx_memory.h"
 #include "xfa/fde/xml/fde_xml_imp.h"
 #include "xfa/fwl/core/fwl_noteimp.h"
 #include "xfa/fxfa/app/xfa_ffnotify.h"
 #include "xfa/fxfa/include/xfa_checksum.h"
 #include "xfa/fxfa/include/xfa_ffapp.h"
 #include "xfa/fxfa/include/xfa_ffdocview.h"
 #include "xfa/fxfa/include/xfa_ffwidget.h"
 #include "xfa/fxfa/include/xfa_fontmgr.h"
+#include "xfa/fxfa/parser/cxfa_dataexporter.h"
+#include "xfa/fxfa/parser/cxfa_dataimporter.h"
 #include "xfa/fxfa/parser/cxfa_document.h"
-#include "xfa/fxfa/parser/xfa_document_serialize.h"
 
 namespace {
 
 struct FX_BASE64DATA {
   uint32_t data1 : 2;
   uint32_t data2 : 6;
   uint32_t data3 : 4;
   uint32_t data4 : 4;
   uint32_t data5 : 6;
   uint32_t data6 : 2;
@@ skipping 451 matching lines @@
 
   return !!pExport->Export(
       pFile, pNode, 0, bsChecksum.GetLength() ? bsChecksum.c_str() : nullptr);
 }
 
 FX_BOOL CXFA_FFDoc::ImportData(IFX_FileRead* pStream, FX_BOOL bXDP) {
   std::unique_ptr<CXFA_DataImporter> importer(
       new CXFA_DataImporter(m_pDocumentParser->GetDocument()));
   return importer->ImportData(pStream);
 }