Remove FX_DWORD from core/ and delete definition

core/fpdfapi/fpdf_page/fpdf_page_doc.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/fpdfapi/fpdf_page/pageint.h"
 
 #include "core/fdrm/crypto/include/fx_crypt.h"
 #include "core/fpdfapi/fpdf_font/cpdf_type1font.h"
@@ skipping 459 matching lines @@
     if (ptData->use_count() == 0) {
       ptData->clear();
     }
   }
 }
 
 CPDF_Image* CPDF_DocPageData::GetImage(CPDF_Object* pImageStream) {
   if (!pImageStream)
     return nullptr;
 
-  const FX_DWORD dwImageObjNum = pImageStream->GetObjNum();
+  const uint32_t dwImageObjNum = pImageStream->GetObjNum();
   auto it = m_ImageMap.find(dwImageObjNum);
   if (it != m_ImageMap.end()) {
     return it->second->AddRef();
   }
 
   CPDF_Image* pImage = new CPDF_Image(m_pPDFDoc);
   pImage->LoadImageF(pImageStream->AsStream(), FALSE);
 
   CPDF_CountedImage* imageData = new CPDF_CountedImage(pImage);
   m_ImageMap[dwImageObjNum] = imageData;
@@ skipping 119 matching lines @@
 }
 
 CPDF_CountedPattern* CPDF_DocPageData::FindPatternPtr(
     CPDF_Object* pPatternObj) const {
   if (!pPatternObj)
     return nullptr;
 
   auto it = m_PatternMap.find(pPatternObj);
   return it != m_PatternMap.end() ? it->second : nullptr;
 }