Remove ownership of CPDFSDK_Document from CPDFXFA_Document

fpdfsdk/cpdfsdk_environment.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 FPDFSDK_CPDFSDK_ENVIRONMENT_H_
 #define FPDFSDK_CPDFSDK_ENVIRONMENT_H_
 
 #include <memory>
@@ skipping 128 matching lines @@
                    int nStart,
                    int nEnd,
                    FPDF_BOOL bSilent,
                    FPDF_BOOL bShrinkToFit,
                    FPDF_BOOL bPrintAsImage,
                    FPDF_BOOL bReverse,
                    FPDF_BOOL bAnnotations);
   void JS_docgotoPage(int nPageNum);
 
   FX_BOOL IsJSInitiated() const { return m_pInfo && m_pInfo->m_pJsPlatform; }
-  void SetSDKDocument(CPDFSDK_Document* pFXDoc) { m_pSDKDoc = pFXDoc; }
-  CPDFSDK_Document* GetSDKDocument() const { return m_pSDKDoc; }
+  CPDFSDK_Document* GetSDKDocument() const { return m_pSDKDoc.get(); }
   UnderlyingDocumentType* GetUnderlyingDocument() const {
     return m_pUnderlyingDoc;
   }
   CFX_ByteString GetAppName() const { return ""; }
   CFX_SystemHandler* GetSysHandler() const { return m_pSysHandler.get(); }
   FPDF_FORMFILLINFO* GetFormFillInfo() const { return m_pInfo; }
 
   // Creates if not present.
   CFFL_InteractiveFormFiller* GetInteractiveFormFiller();
   CPDFSDK_AnnotHandlerMgr* GetAnnotHandlerMgr();  // Creates if not present.
   IJS_Runtime* GetJSRuntime();                    // Creates if not present.
   CPDFSDK_ActionHandler* GetActionHander();       // Creates if not present.
 
  private:
   std::unique_ptr<CPDFSDK_AnnotHandlerMgr> m_pAnnotHandlerMgr;
   std::unique_ptr<CPDFSDK_ActionHandler> m_pActionHandler;
   std::unique_ptr<IJS_Runtime> m_pJSRuntime;
   FPDF_FORMFILLINFO* const m_pInfo;
-  // Ownership of |m_pSDKDoc| depends on if this is XFA. If we're in XFA then
-  // the object is owned by the CPDFXFA_Document. In non-xfa then we own
-  // the pointer.
-  CPDFSDK_Document* m_pSDKDoc;
+  std::unique_ptr<CPDFSDK_Document> m_pSDKDoc;
   UnderlyingDocumentType* const m_pUnderlyingDoc;
   std::unique_ptr<CFFL_InteractiveFormFiller> m_pFormFiller;
   std::unique_ptr<CFX_SystemHandler> m_pSysHandler;
 };
 
 #endif  // FPDFSDK_CPDFSDK_ENVIRONMENT_H_