Fix the code that causes warnings

core/fpdfapi/fpdf_parser/cpdf_document.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_parser/include/cpdf_document.h"
 
 #include <set>
 
@@ skipping 1084 matching lines @@
     if (pLogFont->lfCharSet == ANSI_CHARSET ||
         pLogFont->lfCharSet == DEFAULT_CHARSET ||
         pLogFont->lfCharSet == SYMBOL_CHARSET) {
       if (pLogFont->lfCharSet == SYMBOL_CHARSET)
         flags |= PDFFONT_SYMBOLIC;
       else
         flags |= PDFFONT_NONSYMBOLIC;
       pBaseDict->SetAtName("Encoding", "WinAnsiEncoding");
     } else {
       flags |= PDFFONT_NONSYMBOLIC;
-      int i;
+      size_t i;
       for (i = 0; i < FX_ArraySize(g_FX_CharsetUnicodes); ++i) {
         if (g_FX_CharsetUnicodes[i].m_Charset == pLogFont->lfCharSet)
           break;
       }
       if (i < FX_ArraySize(g_FX_CharsetUnicodes)) {
         CPDF_Dictionary* pEncoding = new CPDF_Dictionary;
         pEncoding->SetAtName("BaseEncoding", "WinAnsiEncoding");
         CPDF_Array* pArray = new CPDF_Array;
         pArray->AddInteger(128);
         const uint16_t* pUnicodes = g_FX_CharsetUnicodes[i].m_pUnicodes;
@@ skipping 13 matching lines @@
     else if (pLogFont->lfItalic)
       basefont += ",Italic";
 
     pBaseDict->SetAtName("Subtype", "TrueType");
     pBaseDict->SetAtName("BaseFont", basefont);
     pBaseDict->SetAtNumber("FirstChar", 32);
     pBaseDict->SetAtNumber("LastChar", 255);
     int char_widths[224];
     GetCharWidth(hDC, 32, 255, char_widths);
     CPDF_Array* pWidths = new CPDF_Array;
-    for (int i = 0; i < 224; i++)
+    for (size_t i = 0; i < 224; i++)
       pWidths->AddInteger(char_widths[i]);
 
     pBaseDict->SetAt("Widths", pWidths);
   } else {
     flags |= PDFFONT_NONSYMBOLIC;
     pFontDict = new CPDF_Dictionary;
     CFX_ByteString cmap;
     CFX_ByteString ordering;
     int supplement = 0;
     CPDF_Array* pWidthArray = new CPDF_Array;
@@ skipping 289 matching lines @@
     }
   }
   pFontDesc->SetAtInteger("StemV", fStemV);
   AddIndirectObject(pFontDesc);
   pFontDict->SetAtReference("FontDescriptor", this, pFontDesc);
   CFRelease(traits);
   CFRelease(languages);
   return LoadFont(pBaseDict);
 }
 #endif  // _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_