Prevent base::CheckedNumeric from leaking outside of pdfium.

core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.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 "../../../include/fxcodec/fx_codec.h"
 #include "../../../include/fpdfapi/fpdf_module.h"
 #include "../../../include/fpdfapi/fpdf_render.h"
 #include "../../../include/fpdfapi/fpdf_pageobj.h"
+#include "../../../src/fxcrt/fx_safe_types.h"
 #include "../fpdf_page/pageint.h"
 #include "render_int.h"
-#include "../../../../third_party/numerics/safe_math.h"
 
 static unsigned int _GetBits8(FX_LPCBYTE pData, int bitpos, int nbits)
 {
     unsigned int byte = pData[bitpos / 8];
     if (nbits == 8) {
         return byte;
     } else if (nbits == 4) {
         return (bitpos % 8) ? (byte & 0x0f) : (byte >> 4);
     } else if (nbits == 2) {
         return (byte >> (6 - bitpos % 8)) & 0x03;
@@ skipping 1542 matching lines @@
     if (!m_bCached) {
         if (m_pBitmap) {
             delete m_pBitmap;
             m_pBitmap = NULL;
         }
         if (m_pMask) {
             delete m_pMask;
         }
     }
 }