Modify xfa code to avoid c4800 warnings

core/fxge/ge/fx_ge_font.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/fxge/ge/fx_text_int.h"
 #include "core/include/fxge/fx_freetype.h"
 #include "core/include/fxge/fx_ge.h"
 
@@ skipping 470 matching lines @@
 
 FX_DWORD CFX_UnicodeEncodingEx::GlyphFromCharCode(FX_DWORD charcode) {
   FXFT_Face face = m_pFont->GetFace();
   FT_UInt nIndex = FXFT_Get_Char_Index(face, charcode);
   if (nIndex > 0) {
     return nIndex;
   }
   int nmaps = FXFT_Get_Face_CharmapCount(face);
   int m = 0;
   while (m < nmaps) {
-    int nEncodingID =
+    FX_DWORD nEncodingID =
         FXFT_Get_Charmap_Encoding(FXFT_Get_Face_Charmaps(face)[m++]);
     if (m_nEncodingID == nEncodingID) {
       continue;
     }
     int error = FXFT_Select_Charmap(face, nEncodingID);
     if (error) {
       continue;
     }
     nIndex = FXFT_Get_Char_Index(face, charcode);
     if (nIndex > 0) {
@@ skipping 34 matching lines @@
   for (size_t i = 0; i < FX_ArraySize(g_EncodingID); ++i) {
     CFX_UnicodeEncodingEx* pFontEncoding =
         _FXFM_CreateFontEncoding(pFont, g_EncodingID[i]);
     if (pFontEncoding) {
       return pFontEncoding;
     }
   }
   return NULL;
 }
 #endif  // PDF_ENABLE_XFA