Fix inheritance in Reading List

components/reading_list/ios/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 source_set("ios") {
   sources = [
     "offline_url_utils.cc",
     "offline_url_utils.h",
     "reading_list_entry.cc",
     "reading_list_entry.h",
     "reading_list_model.cc",
     "reading_list_model.h",
     "reading_list_model_bridge_observer.h",
     "reading_list_model_bridge_observer.mm",
     "reading_list_model_impl.cc",
     "reading_list_model_impl.h",
     "reading_list_model_observer.h",
+    "reading_list_model_storage.cc",
     "reading_list_model_storage.h",
     "reading_list_pref_names.cc",
     "reading_list_pref_names.h",
     "reading_list_store.cc",
     "reading_list_store.h",
     "reading_list_store_delegate.h",
   ]
   deps = [
     "//base",
     "//components/keyed_service/core",
@@ skipping 19 matching lines @@
   deps = [
     ":ios",
     "//base",
     "//base/test:test_support",
     "//components/sync",
     "//components/sync:test_support_model",
     "//testing/gtest",
     "//url",
   ]
 }