Remove NULL in xfa/

xfa/fxfa/include/xfa_ffdoc.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 XFA_FXFA_INCLUDE_XFA_FFDOC_H_
 #define XFA_FXFA_INCLUDE_XFA_FFDOC_H_
 
 #include <map>
@@ skipping 13 matching lines @@
   int32_t iImageYDpi;
 };
 
 class CXFA_FFDoc {
  public:
   CXFA_FFDoc(CXFA_FFApp* pApp, IXFA_DocProvider* pDocProvider);
   ~CXFA_FFDoc();
   IXFA_DocProvider* GetDocProvider() { return m_pDocProvider; }
   uint32_t GetDocType();
   int32_t StartLoad();
-  int32_t DoLoad(IFX_Pause* pPause = NULL);
+  int32_t DoLoad(IFX_Pause* pPause = nullptr);
   void StopLoad();
   CXFA_FFDocView* CreateDocView(uint32_t dwView = 0);
   FX_BOOL OpenDoc(IFX_FileRead* pStream, FX_BOOL bTakeOverFile);
   FX_BOOL OpenDoc(CPDF_Document* pPDFDoc);
   FX_BOOL CloseDoc();
   void SetDocType(uint32_t dwType);
   CXFA_Document* GetXFADoc() { return m_pDocument; }
   CXFA_FFApp* GetApp() { return m_pApp; }
   CXFA_FFDocView* GetDocView(CXFA_LayoutProcessor* pLayout);
   CXFA_FFDocView* GetDocView();
@@ skipping 14 matching lines @@
   CXFA_FFApp* m_pApp;
   CXFA_FFNotify* m_pNotify;
   CPDF_Document* m_pPDFDoc;
   std::map<uint32_t, FX_IMAGEDIB_AND_DPI> m_HashToDibDpiMap;
   std::map<uint32_t, std::unique_ptr<CXFA_FFDocView>> m_TypeToDocViewMap;
   uint32_t m_dwDocType;
   FX_BOOL m_bOwnStream;
 };
 
 #endif  // XFA_FXFA_INCLUDE_XFA_FFDOC_H_