FPDF_PageDelete must delete XFA pages as well.

fpdfsdk/include/fpdfxfa/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_INCLUDE_FPDFXFA_FPDFXFA_DOC_H_
 #define FPDFSDK_INCLUDE_FPDFXFA_FPDFXFA_DOC_H_
 
 #include <vector>
@@ skipping 17 matching lines @@
 
   FX_BOOL LoadXFADoc();
   CPDFXFA_App* GetApp() { return m_pApp; }
   CPDF_Document* GetPDFDoc() { return m_pPDFDoc; }
   IXFA_Doc* GetXFADoc() { return m_pXFADoc; }
   IXFA_DocView* GetXFADocView() { return m_pXFADocView; }
 
   int GetPageCount();
   CPDFXFA_Page* GetPage(int page_index);
   CPDFXFA_Page* GetPage(IXFA_PageView* pPage);
+
+  void DeletePage(int page_index);
   void RemovePage(CPDFXFA_Page* page);
   int GetDocType() { return m_iDocType; }
 
   CPDFSDK_Document* GetSDKDocument(CPDFDoc_Environment* pFormFillEnv);
 
   void FXRect2PDFRect(const CFX_RectF& fxRectF, CFX_FloatRect& pdfRect);
 
   virtual void SetChangeMark(IXFA_Doc* hDoc);
   virtual FX_BOOL GetChangeMark(IXFA_Doc* hDoc);
   // used in dynamic xfa, dwFlags refer to XFA_INVALIDATE_XXX macros.
@@ skipping 167 matching lines @@
   CPDF_Document* m_pPDFDoc;
   CPDFSDK_Document* m_pSDKDoc;
   IXFA_Doc* m_pXFADoc;
   IXFA_DocView* m_pXFADocView;
   CPDFXFA_App* m_pApp;
   IJS_Context* m_pJSContext;
   CFX_ArrayTemplate<CPDFXFA_Page*> m_XFAPageList;
 };
 
 #endif  // FPDFSDK_INCLUDE_FPDFXFA_FPDFXFA_DOC_H_