[heap] Fine-grained JSArrayBuffer tracking

src/heap/objects-visiting-inl.h

Index: src/heap/objects-visiting-inl.h
diff --git a/src/heap/objects-visiting-inl.h b/src/heap/objects-visiting-inl.h
index 01dd3797753076ab400d504afcfb18c792356315..23166495606b7317e20b017960c4bd42393969bd 100644
--- a/src/heap/objects-visiting-inl.h
+++ b/src/heap/objects-visiting-inl.h
@@ -105,11 +105,6 @@ int StaticNewSpaceVisitor<StaticVisitor>::VisitJSArrayBuffer(
     Map* map, HeapObject* object) {
   typedef FlexibleBodyVisitor<StaticVisitor, JSArrayBuffer::BodyDescriptor, int>
       JSArrayBufferBodyVisitor;
-
-  if (!JSArrayBuffer::cast(object)->is_external()) {
-    Heap* heap = map->GetHeap();
-    heap->array_buffer_tracker()->MarkLive(JSArrayBuffer::cast(object));
-  }
   return JSArrayBufferBodyVisitor::Visit(map, object);
 }