Generalize virtually dispatched scavenger to virtually dispatched specialized visitors.

src/serialize.cc

Index: src/serialize.cc
diff --git a/src/serialize.cc b/src/serialize.cc
index 3988b4a893e77ba5bff1bb0331a0c9ecf5f8dcfb..0057d18f1df9f08547379c4b5680b0a660a3655c 100644
--- a/src/serialize.cc
+++ b/src/serialize.cc
@@ -680,14 +680,6 @@ void Deserializer::ReadObject(int space_number,
     LOG(SnapshotPositionEvent(address, source_->position()));
   }
   ReadChunk(current, limit, space_number, address);
-
-  if (space == Heap::map_space()) {
-    ASSERT(size == Map::kSize);
-    HeapObject* obj = HeapObject::FromAddress(address);
-    Map* map = reinterpret_cast<Map*>(obj);
-    map->set_scavenger(Heap::GetScavenger(map->instance_type(),
-                                          map->instance_size()));
-  }
 }