Force compiler to deduce src type for checked_cast<dst, src>.

core/fpdfapi/parser/cpdf_parser.cpp

 // Copyright 2016 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/parser/cpdf_parser.h"
 
 #include <vector>
 
@@ skipping 1001 matching lines @@
   acc.LoadAllData(pStream);
 
   const uint8_t* pData = acc.GetData();
   uint32_t dwTotalSize = acc.GetSize();
   uint32_t segindex = 0;
   for (uint32_t i = 0; i < arrIndex.size(); i++) {
     int32_t startnum = arrIndex[i].first;
     if (startnum < 0)
       continue;
 
-    m_dwXrefStartObjNum =
-        pdfium::base::checked_cast<uint32_t, int32_t>(startnum);
-    uint32_t count =
-        pdfium::base::checked_cast<uint32_t, int32_t>(arrIndex[i].second);
+    m_dwXrefStartObjNum = pdfium::base::checked_cast<uint32_t>(startnum);
+    uint32_t count = pdfium::base::checked_cast<uint32_t>(arrIndex[i].second);
     FX_SAFE_UINT32 dwCaculatedSize = segindex;
     dwCaculatedSize += count;
     dwCaculatedSize *= totalWidth;
     if (!dwCaculatedSize.IsValid() ||
         dwCaculatedSize.ValueOrDie() > dwTotalSize) {
       continue;
     }
 
     const uint8_t* segstart = pData + segindex * totalWidth;
     FX_SAFE_UINT32 dwMaxObjNum = startnum;
@@ skipping 548 matching lines @@
   if (!LoadLinearizedAllCrossRefV4(m_LastXRefOffset, m_dwXrefStartObjNum) &&
       !LoadLinearizedAllCrossRefV5(m_LastXRefOffset)) {
     m_LastXRefOffset = 0;
     m_pSyntax->m_MetadataObjnum = dwSaveMetadataObjnum;
     return FORMAT_ERROR;
   }
 
   m_pSyntax->m_MetadataObjnum = dwSaveMetadataObjnum;
   return SUCCESS;
 }