Remove NULL in xfa/

xfa/fwl/theme/cfwl_scrollbartp.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_THEME_CFWL_SCROLLBARTP_H_
 #define XFA_FWL_THEME_CFWL_SCROLLBARTP_H_
 
 #include "xfa/fwl/theme/cfwl_widgettp.h"
@@ skipping 20 matching lines @@
     FX_ARGB clrBtnBorder[4];
     FX_ARGB clrTrackBKStart;
     FX_ARGB clrTrackBKEnd;
   };
 
   void DrawThumbBtn(CFX_Graphics* pGraphics,
                     const CFX_RectF* pRect,
                     FX_BOOL bVert,
                     FWLTHEME_STATE eState,
                     FX_BOOL bPawButton = TRUE,
-                    CFX_Matrix* pMatrix = NULL);
+                    CFX_Matrix* pMatrix = nullptr);
   void DrawTrack(CFX_Graphics* pGraphics,
                  const CFX_RectF* pRect,
                  FX_BOOL bVert,
                  FWLTHEME_STATE eState,
                  FX_BOOL bLowerTrack,
-                 CFX_Matrix* pMatrix = NULL);
+                 CFX_Matrix* pMatrix = nullptr);
   void DrawMaxMinBtn(CFX_Graphics* pGraphics,
                      const CFX_RectF* pRect,
                      FWLTHEME_DIRECTION eDict,
                      FWLTHEME_STATE eState,
-                     CFX_Matrix* pMatrix = NULL);
+                     CFX_Matrix* pMatrix = nullptr);
   void DrawPaw(CFX_Graphics* pGraphics,
                const CFX_RectF* pRect,
                FX_BOOL bVert,
                FWLTHEME_STATE eState,
-               CFX_Matrix* pMatrix = NULL);
+               CFX_Matrix* pMatrix = nullptr);
   void SetThemeData(uint32_t dwID);
 
   struct SBThemeData* m_pThemeData;
 };
 
 #endif  // XFA_FWL_THEME_CFWL_SCROLLBARTP_H_