Remove NULL in xfa/

xfa/fxfa/include/xfa_ffwidget.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_FFWIDGET_H_
 #define XFA_FXFA_INCLUDE_XFA_FFWIDGET_H_
 
 #include <vector>
@@ skipping 96 matching lines @@
   void ModifyStatus(uint32_t dwAdded, uint32_t dwRemoved);
 
   CXFA_WidgetAcc* GetDataAcc();
   FX_BOOL GetToolTip(CFX_WideString& wsToolTip);
 
   CXFA_FFDocView* GetDocView();
   void SetDocView(CXFA_FFDocView* pDocView);
   CXFA_FFDoc* GetDoc();
   CXFA_FFApp* GetApp();
   IXFA_AppProvider* GetAppProvider();
-  void InvalidateWidget(const CFX_RectF* pRect = NULL);
-  void AddInvalidateRect(const CFX_RectF* pRect = NULL);
+  void InvalidateWidget(const CFX_RectF* pRect = nullptr);
+  void AddInvalidateRect(const CFX_RectF* pRect = nullptr);
   FX_BOOL GetCaptionText(CFX_WideString& wsCap);
   bool IsFocused();
   void Rotate2Normal(FX_FLOAT& fx, FX_FLOAT& fy);
   void GetRotateMatrix(CFX_Matrix& mt);
   FX_BOOL IsLayoutRectEmpty();
   CXFA_FFWidget* GetParent();
   FX_BOOL IsAncestorOf(CXFA_FFWidget* pWidget);
 
  protected:
   virtual FX_BOOL PtInActiveRect(FX_FLOAT fx, FX_FLOAT fy);
@@ skipping 48 matching lines @@
 FX_BOOL XFA_IsCreateWidget(XFA_Element iType);
 #define XFA_DRAWBOX_ForceRound 1
 #define XFA_DRAWBOX_Lowered3D 2
 void XFA_DrawBox(CXFA_Box box,
                  CFX_Graphics* pGS,
                  const CFX_RectF& rtWidget,
                  CFX_Matrix* pMatrix,
                  uint32_t dwFlags = 0);
 
 #endif  // XFA_FXFA_INCLUDE_XFA_FFWIDGET_H_