Fix a few more warnings in chromium_code mode.

core/src/fpdfapi/fpdf_font/fpdf_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 "../../../include/fpdfapi/fpdf_page.h"
 #include "../../../include/fpdfapi/fpdf_module.h"
 #include "../../../include/fpdfapi/fpdf_pageobj.h"
 #include "font_int.h"
@@ skipping 977 matching lines @@
     LoadGlyphMap();
     if (m_pCharNames) {
         FX_DELETE_VECTOR(m_pCharNames, CFX_ByteString, 256);
         m_pCharNames = NULL;
     }
     if (m_Font.m_Face == NULL) {
         return TRUE;
     }
     if (m_Flags & PDFFONT_ALLCAP) {
         unsigned char lowercases[] = {'a', 'z', 0xe0, 0xf6, 0xf8, 0xfd};
-        for (int range = 0; range < sizeof lowercases / 2; range ++) {
+        for (size_t range = 0; range < sizeof lowercases / 2; range ++) {
             for (int i = lowercases[range * 2]; i <= lowercases[range * 2 + 1]; i ++) {
                 if (m_GlyphIndex[i] != 0xffff && m_pFontFile != NULL) {
                     continue;
                 }
                 m_GlyphIndex[i] = m_GlyphIndex[i - 32];
                 if (m_CharWidth[i - 32]) {
                     m_CharWidth[i] = m_CharWidth[i - 32];
                     m_CharBBox[i] = m_CharBBox[i - 32];
                 }
             }
@@ skipping 752 matching lines @@
 }
 CPDF_Type3Char::~CPDF_Type3Char()
 {
     if (m_pForm) {
         delete m_pForm;
     }
     if (m_pBitmap) {
         delete m_pBitmap;
     }
 }