Get rid of NULLs in fpdfsdk/

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 <vector>
@@ skipping 48 matching lines @@
                             FX_BOOL bVisible,
                             const CFX_RectF* pRtAnchor);
   // dwPos: (0:bottom 1:top)
   virtual FX_BOOL GetPopupPos(CXFA_FFWidget* hWidget,
                               FX_FLOAT fMinPopup,
                               FX_FLOAT fMaxPopup,
                               const CFX_RectF& rtAnchor,
                               CFX_RectF& rtPopup);
   virtual FX_BOOL PopupMenu(CXFA_FFWidget* hWidget,
                             CFX_PointF ptPopup,
-                            const CFX_RectF* pRectExclude = NULL);
+                            const CFX_RectF* pRectExclude = nullptr);
 
   // dwFlags XFA_PAGEVIEWEVENT_Added, XFA_PAGEVIEWEVENT_Removing
   virtual void PageViewEvent(CXFA_FFPageView* pPageView, uint32_t dwFlags);
   virtual void WidgetPostAdd(CXFA_FFWidget* hWidget,
                              CXFA_WidgetAcc* pWidgetData);
   virtual void WidgetPreRemove(CXFA_FFWidget* hWidget,
                                CXFA_WidgetAcc* pWidgetData);
 
   // return true if render it.
   virtual FX_BOOL RenderCustomWidget(CXFA_FFWidget* hWidget,
@@ skipping 90 matching lines @@
 
   virtual FX_BOOL GetGlobalProperty(CXFA_FFDoc* hDoc,
                                     const CFX_ByteStringC& szPropName,
                                     CFXJSE_Value* pValue);
   virtual FX_BOOL SetGlobalProperty(CXFA_FFDoc* hDoc,
                                     const CFX_ByteStringC& szPropName,
                                     CFXJSE_Value* pValue);
   virtual CPDF_Document* OpenPDF(CXFA_FFDoc* hDoc,
                                  IFX_FileRead* pFile,
                                  FX_BOOL bTakeOverFile) {
-    return NULL;
+    return nullptr;
   }
 
   virtual IFX_FileRead* OpenLinkedFile(CXFA_FFDoc* hDoc,
                                        const CFX_WideString& wsLink);
 
   FX_BOOL _OnBeforeNotifySumbit();
   void _OnAfterNotifySumbit();
   FX_BOOL _NotifySubmit(FX_BOOL bPrevOrPost);
   FX_BOOL _SubmitData(CXFA_FFDoc* hDoc, CXFA_Submit submit);
   FX_BOOL _MailToInfo(CFX_WideString& csURL,
@@ skipping 33 matching lines @@
   CXFA_FFDoc* m_pXFADoc;
   CXFA_FFDocView* m_pXFADocView;
   CPDFXFA_App* 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_