Revert of [api] Make ObjectTemplate::SetNativeDataProperty() work even if the ObjectTemplate ...

src/conversions-inl.h

Index: src/conversions-inl.h
diff --git a/src/conversions-inl.h b/src/conversions-inl.h
index 730e6477cbee3e0fb781d692ec971d5a32b7ba36..3e56799bc9bab501f43f6be91321d0c694336fa0 100644
--- a/src/conversions-inl.h
+++ b/src/conversions-inl.h
@@ -127,10 +127,6 @@
   return DoubleToUint32(number->Number());
 }
 
-int64_t NumberToInt64(Object* number) {
-  if (number->IsSmi()) return Smi::cast(number)->value();
-  return static_cast<int64_t>(number->Number());
-}
 
 bool TryNumberToSize(Isolate* isolate, Object* number, size_t* result) {
   SealHandleScope shs(isolate);