Call PersistentHandleVisitor directly instead of using ObjectVisitor.

src/objects.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 #include <memory>
 
@@ skipping 10205 matching lines @@
 
   // Visits an external reference embedded into a code object.
   virtual void VisitExternalReference(RelocInfo* rinfo);
 
   // Visits an external reference.
   virtual void VisitExternalReference(Address* p) {}
 
   // 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.
   virtual void Synchronize(VisitorSynchronization::SyncTag tag) {}
 };
 
 
 // BooleanBit is a helper class for setting and getting a bit in an integer.
 class BooleanBit : public AllStatic {
  public:
@@ skipping 11 matching lines @@
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #include "src/objects/object-macros-undef.h"
 
 #endif  // V8_OBJECTS_H_