Move ByteStringPool from document to indirect object holder.

core/fpdfapi/parser/cpdf_indirect_object_holder.h

 // Copyright 2016 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
 
 #ifndef CORE_FPDFAPI_PARSER_CPDF_INDIRECT_OBJECT_HOLDER_H_
 #define CORE_FPDFAPI_PARSER_CPDF_INDIRECT_OBJECT_HOLDER_H_
 
 #include <map>
 #include <memory>
 
+#include "core/fxcrt/cfx_string_pool_template.h"
+#include "core/fxcrt/cfx_weak_ptr.h"
 #include "core/fxcrt/fx_system.h"
 #include "third_party/base/ptr_util.h"
 
 class CPDF_Object;
 
 class CPDF_IndirectObjectHolder {
  public:
   using const_iterator =
       std::map<uint32_t, std::unique_ptr<CPDF_Object>>::const_iterator;
 
@@ skipping 15 matching lines @@
   CPDF_Object* AddIndirectObject(std::unique_ptr<CPDF_Object> pObj);
 
   // Always takes ownership of |pObj|, return true if higher generation number.
   bool ReplaceIndirectObjectIfHigherGeneration(
       uint32_t objnum,
       std::unique_ptr<CPDF_Object> pObj);
 
   uint32_t GetLastObjNum() const { return m_LastObjNum; }
   void SetLastObjNum(uint32_t objnum) { m_LastObjNum = objnum; }
 
+  CFX_WeakPtr<CFX_ByteStringPool> GetByteStringPool() const {
+    return m_pByteStringPool;
+  }
+
   const_iterator begin() const { return m_IndirectObjs.begin(); }
   const_iterator end() const { return m_IndirectObjs.end(); }
 
  protected:
   virtual std::unique_ptr<CPDF_Object> ParseIndirectObject(uint32_t objnum);
 
  private:
   uint32_t m_LastObjNum;
   std::map<uint32_t, std::unique_ptr<CPDF_Object>> m_IndirectObjs;
+  CFX_WeakPtr<CFX_ByteStringPool> m_pByteStringPool;
 };
 
 #endif  // CORE_FPDFAPI_PARSER_CPDF_INDIRECT_OBJECT_HOLDER_H_