Remove SealHandleScope from TryNumberToSize conversion

src/conversions-inl.h

Index: src/conversions-inl.h
diff --git a/src/conversions-inl.h b/src/conversions-inl.h
index 730e6477cbee3e0fb781d692ec971d5a32b7ba36..5fe71e09d3cc49d79277d434c66fbcfbd26e3b55 100644
--- a/src/conversions-inl.h
+++ b/src/conversions-inl.h
@@ -133,7 +133,8 @@ int64_t NumberToInt64(Object* number) {
 }
 
 bool TryNumberToSize(Isolate* isolate, Object* number, size_t* result) {
-  SealHandleScope shs(isolate);
+  // Do not create handles in this function! Don't use SealHandleScope because
+  // the function can be used concurrently.
   if (number->IsSmi()) {
     int value = Smi::cast(number)->value();
     DCHECK(static_cast<unsigned>(Smi::kMaxValue) <=