Remove NULL in xfa/

xfa/fxfa/include/xfa_ffwidgethandler.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_FFWIDGETHANDLER_H_
 #define XFA_FXFA_INCLUDE_XFA_FFWIDGETHANDLER_H_
 
 #include <vector>
 
 #include "xfa/fxfa/include/cxfa_eventparam.h"
 #include "xfa/fxfa/include/fxfa.h"
 #include "xfa/fxfa/parser/xfa_document.h"
 
 class CXFA_FFDocView;
 enum class FWL_WidgetHit;
 
 class CXFA_FFWidgetHandler {
  public:
   CXFA_FFWidgetHandler(CXFA_FFDocView* pDocView);
   ~CXFA_FFWidgetHandler();
 
   CXFA_FFWidget* CreateWidget(CXFA_FFWidget* hParent,
                               XFA_WIDGETTYPE eType,
-                              CXFA_FFWidget* hBefore = NULL);
+                              CXFA_FFWidget* hBefore = nullptr);
 
   FX_BOOL OnMouseEnter(CXFA_FFWidget* hWidget);
   FX_BOOL OnMouseExit(CXFA_FFWidget* hWidget);
   FX_BOOL OnLButtonDown(CXFA_FFWidget* hWidget,
                         uint32_t dwFlags,
                         FX_FLOAT fx,
                         FX_FLOAT fy);
   FX_BOOL OnLButtonUp(CXFA_FFWidget* hWidget,
                       uint32_t dwFlags,
                       FX_FLOAT fx,
@@ skipping 67 matching lines @@
   CXFA_Node* CreateDraw(XFA_Element eElement,
                         CXFA_Node* pParent,
                         CXFA_Node* pBefore) const;
 
   CXFA_Node* CreateSubform(CXFA_Node* pParent, CXFA_Node* pBefore) const;
   CXFA_Node* CreateFormItem(XFA_Element eElement,
                             CXFA_Node* pParent,
                             CXFA_Node* pBefore) const;
   CXFA_Node* CreateCopyNode(XFA_Element eElement,
                             CXFA_Node* pParent,
-                            CXFA_Node* pBefore = NULL) const;
+                            CXFA_Node* pBefore = nullptr) const;
   CXFA_Node* CreateTemplateNode(XFA_Element eElement,
                                 CXFA_Node* pParent,
                                 CXFA_Node* pBefore) const;
   CXFA_Node* CreateFontNode(CXFA_Node* pParent) const;
   CXFA_Node* CreateMarginNode(CXFA_Node* pParent,
                               uint32_t dwFlags,
                               FX_FLOAT fInsets[4]) const;
   CXFA_Node* CreateValueNode(XFA_Element eValue, CXFA_Node* pParent) const;
   CXFA_Document* GetObjFactory() const;
   CXFA_Document* GetXFADoc() const;
 
   CXFA_FFDocView* m_pDocView;
 };
 
 #endif  //  XFA_FXFA_INCLUDE_XFA_FFWIDGETHANDLER_H_