Review and cleanup lint warnings.

core/src/fxcrt/fx_xml_parser.cpp

 // Copyright 2014 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 "core/src/fxcrt/xml_int.h"
 
+#include <vector>
+
 #include "core/include/fxcrt/fx_ext.h"
 #include "core/include/fxcrt/fx_xml.h"
 #include "third_party/base/stl_util.h"
 
 CXML_Parser::~CXML_Parser() {
   if (m_bOwnedStream) {
     m_pDataAcc->Release();
   }
 }
 FX_BOOL CXML_Parser::Init(uint8_t* pBuffer, size_t size) {
@@ skipping 765 matching lines @@
   m_pMap->push_back({space, name, value});
 }
 
 int CXML_AttrMap::GetSize() const {
   return m_pMap ? pdfium::CollectionSize<int>(*m_pMap) : 0;
 }
 
 CXML_AttrItem& CXML_AttrMap::GetAt(int index) const {
   return (*m_pMap)[index];
 }