Call PersistentHandleVisitor directly instead of using ObjectVisitor.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 646cba771ba94a46e8851ddac2e6c0663145c7b2..d4fc29f0d702633e7751cc2762d306377ed8f1a4 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -10223,9 +10223,6 @@ class ObjectVisitor BASE_EMBEDDED {
   // Visits an (encoded) internal reference.
   virtual void VisitInternalReference(RelocInfo* rinfo) {}
 
-  // Visits a handle that has an embedder-assigned class ID.
-  virtual void VisitEmbedderReference(Object** p, uint16_t class_id) {}
-
   // Intended for serialization/deserialization checking: insert, or
   // check for the presence of, a tag at this position in the stream.
   // Also used for marking up GC roots in heap snapshots.