Remove FX_DWORD from core/ and delete definition

core/fxcodec/jbig2/JBig2_ArithIntDecoder.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/fxcodec/jbig2/JBig2_ArithIntDecoder.h"
 
 #include <vector>
 
@@ skipping 63 matching lines @@
 }
 
 CJBig2_ArithIaidDecoder::CJBig2_ArithIaidDecoder(unsigned char SBSYMCODELENA)
     : SBSYMCODELEN(SBSYMCODELENA) {
   m_IAID.resize(1 << SBSYMCODELEN);
 }
 
 CJBig2_ArithIaidDecoder::~CJBig2_ArithIaidDecoder() {}
 
 void CJBig2_ArithIaidDecoder::decode(CJBig2_ArithDecoder* pArithDecoder,
-                                     FX_DWORD* nResult) {
+                                     uint32_t* nResult) {
   int PREV = 1;
   for (unsigned char i = 0; i < SBSYMCODELEN; ++i) {
     JBig2ArithCtx* pCX = &m_IAID[PREV];
     int D = pArithDecoder->DECODE(pCX);
     PREV = ShiftOr(PREV, D);
   }
   *nResult = PREV - (1 << SBSYMCODELEN);
 }