Remove custom memory manager

core/src/fpdfdoc/doc_metadata.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 "../../include/fpdfdoc/fpdf_doc.h"
 #include "../../include/fxcrt/fx_xml.h"
 typedef struct _PDFDOC_METADATA {
     CPDF_Document *m_pDoc;
     CXML_Element *m_pXmlElmnt;
     CXML_Element *m_pElmntRdf;
     CFX_CMapByteStringToPtr *m_pStringMap;
 } PDFDOC_METADATA, * PDFDOC_LPMETADATA;
 typedef PDFDOC_METADATA const * PDFDOC_LPCMETADATA;
 const FX_LPCSTR gs_FPDFDOC_Metadata_Titles[] = {
     "Title", "title",
     "Subject", "description",
     "Author", "creator",
     "Keywords", "Keywords",
     "Producer", "Producer",
     "Creator", "CreatorTool",
     "CreationDate", "CreateDate",
     "ModDate", "ModifyDate",
     "MetadataDate", "MetadataDate"
 };
 CPDF_Metadata::CPDF_Metadata()
 {
     m_pData = FX_Alloc(PDFDOC_METADATA, 1);
-    FXSYS_memset32(m_pData, 0, sizeof(PDFDOC_METADATA));
     CFX_CMapByteStringToPtr *&pStringMap = ((PDFDOC_LPMETADATA)m_pData)->m_pStringMap;
     pStringMap = FX_NEW(CFX_CMapByteStringToPtr);
     if (pStringMap != NULL) {
         CFX_ByteString bstr;
         for (int i = 0; i < 18; i += 2) {
             bstr = gs_FPDFDOC_Metadata_Titles[i];
             pStringMap->AddValue(bstr, (void*)gs_FPDFDOC_Metadata_Titles[i + 1]);
         }
     }
 }
@@ skipping 102 matching lines @@
     return -1;
 }
 CXML_Element* CPDF_Metadata::GetRoot() const
 {
     return ((PDFDOC_LPMETADATA)m_pData)->m_pXmlElmnt;
 }
 CXML_Element* CPDF_Metadata::GetRDF() const
 {
     return ((PDFDOC_LPMETADATA)m_pData)->m_pElmntRdf;
 }