Get rid of NULLs in xfa/

xfa/fxfa/include/xfa_ffwidgethandler.h

Index: xfa/fxfa/include/xfa_ffwidgethandler.h
diff --git a/xfa/fxfa/include/xfa_ffwidgethandler.h b/xfa/fxfa/include/xfa_ffwidgethandler.h
index 8159d87cf093e42f54803690600de1ce0594dae9..fd487d1cb7144f8095f1a7c386a7bc1b86b31a89 100644
--- a/xfa/fxfa/include/xfa_ffwidgethandler.h
+++ b/xfa/fxfa/include/xfa_ffwidgethandler.h
@@ -22,7 +22,7 @@ class 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);
@@ -69,7 +69,7 @@ class CXFA_FFWidgetHandler {
   FX_BOOL OnSetCursor(CXFA_FFWidget* hWidget, FX_FLOAT fx, FX_FLOAT fy);
   void RenderWidget(CXFA_FFWidget* hWidget,
                     CFX_Graphics* pGS,
-                    CFX_Matrix* pMatrix = NULL,
+                    CFX_Matrix* pMatrix = nullptr,
                     FX_BOOL bHighlight = FALSE);
   FX_BOOL HasEvent(CXFA_WidgetAcc* pWidgetAcc, XFA_EVENTTYPE eEventType);
   int32_t ProcessEvent(CXFA_WidgetAcc* pWidgetAcc, CXFA_EventParam* pParam);
@@ -110,7 +110,7 @@ class CXFA_FFWidgetHandler {
                             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;