Use unique_ptr for CXFA_XMLParser.

xfa/fxfa/parser/cxfa_xml_parser.cpp

 // Copyright 2016 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "xfa/fxfa/parser/cxfa_xml_parser.h"
 
 CXFA_XMLParser::CXFA_XMLParser(CFDE_XMLNode* pRoot,
                                const CFX_RetainPtr<IFGAS_Stream>& pStream)
@@ skipping 11 matching lines @@
   m_NodeStack.Push(m_pParent);
   m_pParser->Init(m_pStream, 32 * 1024, 1024 * 1024);
 }
 
 CXFA_XMLParser::~CXFA_XMLParser() {
   m_NodeStack.RemoveAll(false);
   m_ws1.clear();
   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;
   if (m_syntaxParserResult == FDE_XmlSyntaxResult::EndOfString)
     return 100;
 
   int32_t iCount = 0;
   while (true) {
     m_syntaxParserResult = m_pParser->DoSyntaxParse();
     switch (m_syntaxParserResult) {
@@ skipping 122 matching lines @@
     }
     if (pPause && iCount > 500 && pPause->NeedToPauseNow()) {
       break;
     }
   }
   return (m_syntaxParserResult == FDE_XmlSyntaxResult::Error ||
           m_NodeStack.GetSize() != 1)
              ? -1
              : m_pParser->GetStatus();
 }