Move ByteStringPool from document to indirect object holder.

core/fpdfapi/parser/cfdf_document.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 "core/fpdfapi/parser/cfdf_document.h"
 
 #include "core/fpdfapi/edit/cpdf_creator.h"
 #include "core/fpdfapi/parser/cpdf_dictionary.h"
 #include "core/fpdfapi/parser/cpdf_syntax_parser.h"
 #include "third_party/base/ptr_util.h"
 
 CFDF_Document::CFDF_Document()
     : CPDF_IndirectObjectHolder(),
       m_pRootDict(nullptr),
       m_pFile(nullptr),
-      m_bOwnFile(false),
-      m_pByteStringPool(pdfium::MakeUnique<CFX_ByteStringPool>()) {}
+      m_bOwnFile(false) {}
 
 CFDF_Document::~CFDF_Document() {
   if (m_bOwnFile && m_pFile)
     m_pFile->Release();
-  m_pByteStringPool.DeleteObject();  // Make weak.
 }
 
 CFDF_Document* CFDF_Document::CreateNewDoc() {
   CFDF_Document* pDoc = new CFDF_Document;
   pDoc->m_pRootDict =
       pDoc->NewIndirect<CPDF_Dictionary>(pDoc->GetByteStringPool());
   pDoc->m_pRootDict->SetFor("FDF",
                             new CPDF_Dictionary(pDoc->GetByteStringPool()));
   return pDoc;
 }
@@ skipping 63 matching lines @@
 
   buf << "%FDF-1.2\r\n";
   for (const auto& pair : *this)
     buf << pair.first << " 0 obj\r\n"
         << pair.second.get() << "\r\nendobj\r\n\r\n";
 
   buf << "trailer\r\n<</Root " << m_pRootDict->GetObjNum()
       << " 0 R>>\r\n%%EOF\r\n";
   return true;
 }