Remove NULL in xfa/

xfa/fxfa/parser/xfa_parser_imp.h

Index: xfa/fxfa/parser/xfa_parser_imp.h
diff --git a/xfa/fxfa/parser/xfa_parser_imp.h b/xfa/fxfa/parser/xfa_parser_imp.h
index 3a56cc09961e04fe46ed627cf6e89caf819d0ace..df0b31dc69de2c7e72c80d98c6a2bd2d74d2b8dd 100644
--- a/xfa/fxfa/parser/xfa_parser_imp.h
+++ b/xfa/fxfa/parser/xfa_parser_imp.h
@@ -21,10 +21,10 @@ class CXFA_SimpleParser : public IXFA_Parser {
   void Release() override;
   int32_t StartParse(IFX_FileRead* pStream,
                      XFA_XDPPACKET ePacketID = XFA_XDPPACKET_XDP) override;
-  int32_t DoParse(IFX_Pause* pPause = NULL) override;
+  int32_t DoParse(IFX_Pause* pPause = nullptr) override;
   int32_t ParseXMLData(const CFX_WideString& wsXML,
                        CFDE_XMLNode*& pXMLNode,
-                       IFX_Pause* pPause = NULL) override;
+                       IFX_Pause* pPause = nullptr) override;
   void ConstructXFANode(CXFA_Node* pXFANode, CFDE_XMLNode* pXMLNode) override;
   CXFA_Document* GetFactory() const override;
   CXFA_Node* GetRootNode() const override;
@@ -91,10 +91,10 @@ class CXFA_DocumentParser : public IXFA_Parser {
   void Release() override;
   int32_t StartParse(IFX_FileRead* pStream,
                      XFA_XDPPACKET ePacketID = XFA_XDPPACKET_XDP) override;
-  int32_t DoParse(IFX_Pause* pPause = NULL) override;
+  int32_t DoParse(IFX_Pause* pPause = nullptr) override;
   int32_t ParseXMLData(const CFX_WideString& wsXML,
                        CFDE_XMLNode*& pXMLNode,
-                       IFX_Pause* pPause = NULL) override;
+                       IFX_Pause* pPause = nullptr) override;
   void ConstructXFANode(CXFA_Node* pXFANode, CFDE_XMLNode* pXMLNode) override;
   CXFA_Document* GetFactory() const override;
   CXFA_Node* GetRootNode() const override;