Use unique_ptr for CXFA_XMLParser.

xfa/fxfa/parser/cxfa_xml_parser.cpp

Index: xfa/fxfa/parser/cxfa_xml_parser.cpp
diff --git a/xfa/fxfa/parser/cxfa_xml_parser.cpp b/xfa/fxfa/parser/cxfa_xml_parser.cpp
index 6d2ef350d9e8a3693a79fede5af08ac40a76645f..95920d9773059ee2c54f922b7a4ab3c9b9c87810 100644
--- a/xfa/fxfa/parser/cxfa_xml_parser.cpp
+++ b/xfa/fxfa/parser/cxfa_xml_parser.cpp
@@ -29,10 +29,6 @@ CXFA_XMLParser::~CXFA_XMLParser() {
   m_ws2.clear();
 }
 
-void CXFA_XMLParser::Release() {
-  delete this;
-}
-
 int32_t CXFA_XMLParser::DoParser(IFX_Pause* pPause) {
   if (m_syntaxParserResult == FDE_XmlSyntaxResult::Error)
     return -1;