Make creation of CPDFSDK_Document clearer

fpdfsdk/fpdfxfa/include/fpdfxfa_doc.h

 // 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
 
 #ifndef FPDFSDK_FPDFXFA_INCLUDE_FPDFXFA_DOC_H_
 #define FPDFSDK_FPDFXFA_INCLUDE_FPDFXFA_DOC_H_
 
 #include <memory>
@@ skipping 20 matching lines @@
 class CPDFXFA_Document {
  public:
   CPDFXFA_Document(std::unique_ptr<CPDF_Document> pPDFDoc,
                    CPDFXFA_App* pProvider);
   ~CPDFXFA_Document();
 
   FX_BOOL LoadXFADoc();
   CPDF_Document* GetPDFDoc() { return m_pPDFDoc.get(); }
   CXFA_FFDoc* GetXFADoc() { return m_pXFADoc.get(); }
   CXFA_FFDocView* GetXFADocView() { return m_pXFADocView; }
-  CPDFSDK_Document* GetSDKDocument(CPDFSDK_Environment* pFormFillEnv);
   int GetDocType() const { return m_iDocType; }
 
+  CPDFSDK_Document* GetSDKDoc() const { return m_pSDKDoc.get(); }
+  void SetSDKDoc(std::unique_ptr<CPDFSDK_Document> pSDKDoc);
+
   void DeletePage(int page_index);
   int GetPageCount() const;
 
   CPDFXFA_Page* GetXFAPage(int page_index);
   CPDFXFA_Page* GetXFAPage(CXFA_FFPageView* pPage) const;
 
   void RemovePage(CPDFXFA_Page* page);
 
   void ClearChangeMark();
 
  protected:
   friend class CPDFXFA_DocEnvironment;
 
-  CPDFSDK_Document* GetSDKDoc() { return m_pSDKDoc.get(); }
   int GetOriginalPageCount() const { return m_nPageCount; }
   void SetOriginalPageCount(int count) {
     m_nPageCount = count;
     m_XFAPageList.SetSize(count);
   }
 
   LoadStatus GetLoadStatus() const { return m_nLoadStatus; }
 
   CFX_ArrayTemplate<CPDFXFA_Page*>* GetXFAPageList() { return &m_XFAPageList; }
 
@@ skipping 17 matching lines @@
   CPDFXFA_App* const m_pApp;
   CFX_ArrayTemplate<CPDFXFA_Page*> m_XFAPageList;
   LoadStatus m_nLoadStatus;
   int m_nPageCount;
 
   // Must be destroy before |m_pSDKDoc|.
   CPDFXFA_DocEnvironment m_DocEnv;
 };
 
 #endif  // FPDFSDK_FPDFXFA_INCLUDE_FPDFXFA_DOC_H_