Remove FX_DWORD from core/ and delete definition

core/fxcodec/jbig2/JBig2_ArithIntDecoder.h

 // 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
 
 #ifndef CORE_FXCODEC_JBIG2_JBIG2_ARITHINTDECODER_H_
 #define CORE_FXCODEC_JBIG2_JBIG2_ARITHINTDECODER_H_
 
 #include <vector>
@@ skipping 12 matching lines @@
 
  private:
   std::vector<JBig2ArithCtx> m_IAx;
 };
 
 class CJBig2_ArithIaidDecoder {
  public:
   explicit CJBig2_ArithIaidDecoder(unsigned char SBSYMCODELENA);
   ~CJBig2_ArithIaidDecoder();
 
-  void decode(CJBig2_ArithDecoder* pArithDecoder, FX_DWORD* nResult);
+  void decode(CJBig2_ArithDecoder* pArithDecoder, uint32_t* nResult);
 
  private:
   std::vector<JBig2ArithCtx> m_IAID;
 
   const unsigned char SBSYMCODELEN;
 };
 
 #endif  // CORE_FXCODEC_JBIG2_JBIG2_ARITHINTDECODER_H_