Remove NULL in xfa/

xfa/fwl/basewidget/fwl_formproxyimp.cpp

Index: xfa/fwl/basewidget/fwl_formproxyimp.cpp
diff --git a/xfa/fwl/basewidget/fwl_formproxyimp.cpp b/xfa/fwl/basewidget/fwl_formproxyimp.cpp
index 2b76078e0c32ed51781c67b004eba83a8e632dcb..0317ae38b2f15d1f85b953050422092827b95bea 100644
--- a/xfa/fwl/basewidget/fwl_formproxyimp.cpp
+++ b/xfa/fwl/basewidget/fwl_formproxyimp.cpp
@@ -54,6 +54,6 @@ CFWL_FormProxyImpDelegate::CFWL_FormProxyImpDelegate(CFWL_FormProxyImp* pOwner)
     : m_pOwner(pOwner) {}
 
 void CFWL_FormProxyImpDelegate::OnProcessMessage(CFWL_Message* pMessage) {
-  IFWL_WidgetDelegate* pDelegate = m_pOwner->m_pOuter->SetDelegate(NULL);
+  IFWL_WidgetDelegate* pDelegate = m_pOwner->m_pOuter->SetDelegate(nullptr);
   pDelegate->OnProcessMessage(pMessage);
 }