[heap] Ceanup: Remove weak cell scavenging code

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index a524af14883071213d8c645d6d7da8b31dc453e4..aebd768ba4c9347a994df98317b9444fa8e96f79 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -1672,8 +1672,6 @@ void Heap::Scavenge() {
     TRACE_GC(tracer(), GCTracer::Scope::SCAVENGER_WEAK);
     // Copy objects reachable from the encountered weak collections list.
     scavenge_visitor.VisitPointer(&encountered_weak_collections_);
-    // Copy objects reachable from the encountered weak cells.
-    scavenge_visitor.VisitPointer(&encountered_weak_cells_);
   }
 
   {