Fix a bunch of sign mismatch warnings.

core/src/fxge/ge/fx_ge_linux.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/fxge/fx_ge.h"
 #include "../agg/include/fx_agg_driver.h"
 #include "text_int.h"
 
@@ skipping 102 matching lines @@
         break;
       }
       for (int32_t i = 0; i < LINUX_GPNAMESIZE; i++) {
         auto it = m_FontList.find(LinuxGpFontList[index].NameArr[i]);
         if (it != m_FontList.end()) {
           return it->second;
         }
       }
     } break;
     case FXFONT_GB2312_CHARSET: {
-      for (int32_t i = 0; i < FX_ArraySize(g_LinuxGbFontList); ++i) {
+      for (size_t i = 0; i < FX_ArraySize(g_LinuxGbFontList); ++i) {
         auto it = m_FontList.find(g_LinuxGbFontList[i]);
         if (it != m_FontList.end()) {
           return it->second;
         }
       }
     } break;
     case FXFONT_CHINESEBIG5_CHARSET: {
-      for (int32_t i = 0; i < FX_ArraySize(g_LinuxB5FontList); ++i) {
+      for (size_t i = 0; i < FX_ArraySize(g_LinuxB5FontList); ++i) {
         auto it = m_FontList.find(g_LinuxB5FontList[i]);
         if (it != m_FontList.end()) {
           return it->second;
         }
       }
     } break;
     case FXFONT_HANGEUL_CHARSET: {
-      for (int32_t i = 0; i < FX_ArraySize(g_LinuxHGFontList); ++i) {
+      for (size_t i = 0; i < FX_ArraySize(g_LinuxHGFontList); ++i) {
         auto it = m_FontList.find(g_LinuxHGFontList[i]);
         if (it != m_FontList.end()) {
           return it->second;
         }
       }
     } break;
     default:
       bCJK = FALSE;
       break;
   }
@@ skipping 94 matching lines @@
     AddPath(*pPath);
   }
   return TRUE;
 }
 void CFX_GEModule::InitPlatform() {
   m_pFontMgr->SetSystemFontInfo(
       IFX_SystemFontInfo::CreateDefault(m_pUserFontPaths));
 }
 void CFX_GEModule::DestroyPlatform() {}
 #endif  // _FXM_PLATFORM_ == _FXM_PLATFORM_LINUX_