Remove NULL in xfa/

xfa/fwl/basewidget/fwl_pictureboximp.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_FWL_BASEWIDGET_FWL_PICTUREBOXIMP_H_
 #define XFA_FWL_BASEWIDGET_FWL_PICTUREBOXIMP_H_
 
 #include "xfa/fwl/core/fwl_widgetimp.h"
@@ skipping 17 matching lines @@
   FWL_Error GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize = FALSE) override;
   FWL_Error Update() override;
   FWL_Error DrawWidget(CFX_Graphics* pGraphics,
                        const CFX_Matrix* pMatrix = nullptr) override;
 
  protected:
   friend class CFWL_PictureBoxImpDelegate;
 
   void DrawBkground(CFX_Graphics* pGraphics,
                     IFWL_ThemeProvider* pTheme,
-                    const CFX_Matrix* pMatrix = NULL);
+                    const CFX_Matrix* pMatrix = nullptr);
 
   FX_BOOL VStyle(FX_BOOL dwStyle);
   CFX_RectF m_rtClient;
   CFX_RectF m_rtImage;
   CFX_Matrix m_matrix;
   FX_BOOL m_bTop;
   FX_BOOL m_bVCenter;
   FX_BOOL m_bButton;
 };
 
 class CFWL_PictureBoxImpDelegate : public CFWL_WidgetImpDelegate {
  public:
   CFWL_PictureBoxImpDelegate(CFWL_PictureBoxImp* pOwner);
   void OnDrawWidget(CFX_Graphics* pGraphics,
-                    const CFX_Matrix* pMatrix = NULL) override;
+                    const CFX_Matrix* pMatrix = nullptr) override;
 
  protected:
   CFWL_PictureBoxImp* m_pOwner;
 };
 
 #endif  // XFA_FWL_BASEWIDGET_FWL_PICTUREBOXIMP_H_