Get rid of NULLs in xfa/

xfa/fxfa/app/xfa_ffnotify.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_APP_XFA_FFNOTIFY_H_
 #define XFA_FXFA_APP_XFA_FFNOTIFY_H_
 
 #include "xfa/fxfa/parser/xfa_document.h"
@@ skipping 35 matching lines @@
                             FX_FLOAT& fCalcWidth,
                             FX_FLOAT& fCalcHeight);
   FX_BOOL FindSplitPos(CXFA_Node* pItem,
                        int32_t iBlockIndex,
                        FX_FLOAT& fCalcHeightPos);
   FX_BOOL RunScript(CXFA_Node* pScript, CXFA_Node* pFormItem);
   int32_t ExecEventByDeepFirst(CXFA_Node* pFormNode,
                                XFA_EVENTTYPE eEventType,
                                FX_BOOL bIsFormReady = FALSE,
                                FX_BOOL bRecursive = TRUE,
-                               CXFA_WidgetAcc* pExclude = NULL);
+                               CXFA_WidgetAcc* pExclude = nullptr);
   void AddCalcValidate(CXFA_Node* pNode);
   CXFA_FFDoc* GetHDOC();
   IXFA_DocProvider* GetDocProvider();
   IXFA_AppProvider* GetAppProvider();
   CXFA_FFWidgetHandler* GetWidgetHandler();
   CXFA_FFWidget* GetHWidget(CXFA_LayoutItem* pLayoutItem);
   void OpenDropDownList(CXFA_FFWidget* hWidget);
   CFX_WideString GetCurrentDateTime();
-  void ResetData(CXFA_WidgetData* pWidgetData = NULL);
+  void ResetData(CXFA_WidgetData* pWidgetData = nullptr);
   int32_t GetLayoutStatus();
   void RunNodeInitialize(CXFA_Node* pNode);
   void RunSubformIndexChange(CXFA_Node* pSubformNode);
   CXFA_Node* GetFocusWidgetNode();
   void SetFocusWidgetNode(CXFA_Node* pNode);
 
  protected:
   CXFA_FFDoc* const m_pDoc;
 };
 
 #endif  // XFA_FXFA_APP_XFA_FFNOTIFY_H_