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

core/fpdfapi/parser/cpdf_parser.cpp

Index: core/fpdfapi/parser/cpdf_parser.cpp
diff --git a/core/fpdfapi/parser/cpdf_parser.cpp b/core/fpdfapi/parser/cpdf_parser.cpp
index 905f36622ade59cd37d04342343269e36cd1c3c5..d62e538fcf9f888423ae0f7773ecd42cd60dad8d 100644
--- a/core/fpdfapi/parser/cpdf_parser.cpp
+++ b/core/fpdfapi/parser/cpdf_parser.cpp
@@ -1019,10 +1019,8 @@ bool CPDF_Parser::LoadCrossRefV5(FX_FILESIZE* pos, bool bMainXRef) {
     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;