Use stdint.h types throughout PDFium.

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;
@@ skipping 55 matching lines @@
     if (!pXmlElmnt) {
         return;
     }
     CXML_Element *&pElmntRdf = ((PDFDOC_LPMETADATA)m_pData)->m_pElmntRdf;
     if (pXmlElmnt->GetTagName() == FX_BSTRC("RDF")) {
         pElmntRdf = pXmlElmnt;
     } else {
         pElmntRdf = pXmlElmnt->GetElement(NULL, FX_BSTRC("RDF"));
     }
 }
-FX_INT32 CPDF_Metadata::GetString(FX_BSTR bsItem, CFX_WideString &wsStr)
+int32_t CPDF_Metadata::GetString(FX_BSTR bsItem, CFX_WideString &wsStr)
 {
     if (!((PDFDOC_LPMETADATA)m_pData)->m_pXmlElmnt) {
         return -1;
     }
     if (!((PDFDOC_LPMETADATA)m_pData)->m_pStringMap) {
         return -1;
     }
     void *szTag;
     if (!((PDFDOC_LPMETADATA)m_pData)->m_pStringMap->Lookup(bsItem, szTag)) {
         return -1;
@@ skipping 52 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;
 }