Simplified slot buffer logic during weak list visiting.

src/objects-visiting.h

Index: src/objects-visiting.h
diff --git a/src/objects-visiting.h b/src/objects-visiting.h
index 05f82574ccaeb9f46fca4d0b349083ae221a358d..d9ab02a20f80607d419e178ef8b12a49d25b2098 100644
--- a/src/objects-visiting.h
+++ b/src/objects-visiting.h
@@ -469,10 +469,7 @@ class WeakObjectRetainer;
 // pointers. The template parameter T is a WeakListVisitor that defines how to
 // access the next-element pointers.
 template <class T>
-Object* VisitWeakList(Heap* heap,
-                      Object* list,
-                      WeakObjectRetainer* retainer,
-                      bool record_slots);
+Object* VisitWeakList(Heap* heap, Object* list, WeakObjectRetainer* retainer);
 
 } }  // namespace v8::internal