Move DescriptorArray into the map

src/transitions-inl.h

Index: src/transitions-inl.h
diff --git a/src/transitions-inl.h b/src/transitions-inl.h
index 95a400e52ac8071699b7e305f4360ed3ce02e404..2df30028317e0c64e71c7f8edfc39e706cbd4339 100644
--- a/src/transitions-inl.h
+++ b/src/transitions-inl.h
@@ -84,23 +84,6 @@ void TransitionArray::set_elements_transition(Map* transition_map,
 }
 
 
-Object** TransitionArray::GetDescriptorsSlot() {
-  return HeapObject::RawField(reinterpret_cast<HeapObject*>(this),
-                              kDescriptorsOffset);
-}
-
-
-DescriptorArray* TransitionArray::descriptors() {
-  return DescriptorArray::cast(get(kDescriptorsIndex));
-}
-
-
-void TransitionArray::set_descriptors(DescriptorArray* descriptors) {
-  ASSERT(descriptors->IsDescriptorArray());
-  set(kDescriptorsIndex, descriptors);
-}
-
-
 Object* TransitionArray::back_pointer_storage() {
   return get(kBackPointerStorageIndex);
 }