Use smart pointers for class owned pointers

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 "xfa/fxfa/include/xfa_ffdoc.h"
 
+#include <memory>
 #include <vector>
 
 #include "public/fpdfview.h"
 #include "xfa/fxfa/include/fxfa.h"
 #include "xfa/fxfa/include/xfa_ffdochandler.h"
 
 class CPDFXFA_App;
 class CPDFXFA_Document;
 class CPDFXFA_Page;
 class CPDFSDK_Document;
 class CPDFDoc_Environment;
 class IJS_Runtime;
 class IJS_Context;
 class CXFA_FFDocHandler;
 
 class CPDFXFA_Document : public IXFA_DocProvider {
  public:
   CPDFXFA_Document(CPDF_Document* pPDFDoc, CPDFXFA_App* pProvider);
   ~CPDFXFA_Document() override;
 
   FX_BOOL LoadXFADoc();
   CPDFXFA_App* GetApp() { return m_pApp; }
   CPDF_Document* GetPDFDoc() { return m_pPDFDoc; }
-  CXFA_FFDoc* GetXFADoc() { return m_pXFADoc; }
+  CXFA_FFDoc* GetXFADoc() { return m_pXFADoc.get(); }
   CXFA_FFDocView* GetXFADocView() { return m_pXFADocView; }
 
   int GetPageCount();
   CPDFXFA_Page* GetPage(int page_index);
   CPDFXFA_Page* GetPage(CXFA_FFPageView* pPage);
 
   void DeletePage(int page_index);
   void RemovePage(CPDFXFA_Page* page);
   int GetDocType() { return m_iDocType; }
 
@@ skipping 140 matching lines @@
     FXFA_LOADSTATUS_PRELOAD = 0,
     FXFA_LOADSTATUS_LOADING,
     FXFA_LOADSTATUS_LOADED,
     FXFA_LOADSTATUS_CLOSING,
     FXFA_LOADSTATUS_CLOSED
   };
 
   void CloseXFADoc(CXFA_FFDocHandler* pDoc) {
     if (pDoc) {
       m_pXFADoc->CloseDoc();
-      delete m_pXFADoc;
-      m_pXFADoc = nullptr;
+      m_pXFADoc.reset();
       m_pXFADocView = nullptr;
     }
   }
 
   int m_iDocType;
   CPDF_Document* m_pPDFDoc;
-  CPDFSDK_Document* m_pSDKDoc;
-  CXFA_FFDoc* m_pXFADoc;
-  CXFA_FFDocView* m_pXFADocView;
-  CPDFXFA_App* m_pApp;
+  std::unique_ptr<CPDFSDK_Document> m_pSDKDoc;
+  std::unique_ptr<CXFA_FFDoc> m_pXFADoc;
+  CXFA_FFDocView* m_pXFADocView;  // not owned.
+  CPDFXFA_App* const m_pApp;
   IJS_Context* m_pJSContext;
   CFX_ArrayTemplate<CPDFXFA_Page*> m_XFAPageList;
   LoadStatus m_nLoadStatus;
   int m_nPageCount;
 };
 
 #endif  // FPDFSDK_FPDFXFA_INCLUDE_FPDFXFA_DOC_H_