Remove FX_DWORD from core/ and delete definition

core/fpdfapi/fpdf_parser/cpdf_reference.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 "core/fpdfapi/fpdf_parser/include/cpdf_reference.h"
 
 #include "core/fpdfapi/fpdf_parser/include/cpdf_indirect_object_holder.h"
 
@@ skipping 44 matching lines @@
 }
 
 CPDF_Object* CPDF_Reference::Clone(FX_BOOL bDirect) const {
   if (bDirect) {
     auto* pDirect = GetDirect();
     return pDirect ? pDirect->Clone(TRUE) : nullptr;
   }
   return new CPDF_Reference(m_pObjList, m_RefObjNum);
 }
 
-void CPDF_Reference::SetRef(CPDF_IndirectObjectHolder* pDoc, FX_DWORD objnum) {
+void CPDF_Reference::SetRef(CPDF_IndirectObjectHolder* pDoc, uint32_t objnum) {
   m_pObjList = pDoc;
   m_RefObjNum = objnum;
 }
 
 CPDF_Object* CPDF_Reference::GetDirect() const {
   return m_pObjList ? m_pObjList->GetIndirectObject(m_RefObjNum) : nullptr;
 }