Get rid of NULLs in xfa/

xfa/fxfa/include/fxfa.h

Index: xfa/fxfa/include/fxfa.h
diff --git a/xfa/fxfa/include/fxfa.h b/xfa/fxfa/include/fxfa.h
index 7b40cd8cb1fb8eb5569ae91ad32df2f82d72c65d..ae590be72713d99a2305f7d5f7fda174b9835dae 100644
--- a/xfa/fxfa/include/fxfa.h
+++ b/xfa/fxfa/include/fxfa.h
@@ -353,7 +353,7 @@ class IXFA_DocProvider {
                               CFX_RectF& rtPopup) = 0;
   virtual FX_BOOL PopupMenu(CXFA_FFWidget* hWidget,
                             CFX_PointF ptPopup,
-                            const CFX_RectF* pRectExclude = NULL) = 0;
+                            const CFX_RectF* pRectExclude = nullptr) = 0;
   virtual void PageViewEvent(CXFA_FFPageView* pPageView, uint32_t dwFlags) = 0;
   virtual void WidgetPostAdd(CXFA_FFWidget* hWidget,
                              CXFA_WidgetAcc* pWidgetData) = 0;
@@ -437,7 +437,7 @@ class IXFA_DocProvider {
 class CXFA_EventParam {
  public:
   CXFA_EventParam() {
-    m_pTarget = NULL;
+    m_pTarget = nullptr;
     m_eType = XFA_EVENT_Unknown;
     m_wsResult.clear();
     Reset();