Enable RL sync by default on iOS

ios/chrome/browser/sync/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("sync") {
   configs += [ "//build/config/compiler:enable_arc" ]
   sources = [
     "ios_chrome_profile_sync_service_factory.cc",
     "ios_chrome_profile_sync_service_factory.h",
     "ios_chrome_sync_client.h",
@@ skipping 13 matching lines @@
     "//components/browser_sync",
     "//components/dom_distiller/core",
     "//components/history/core/browser",
     "//components/invalidation/impl",
     "//components/keyed_service/core",
     "//components/keyed_service/ios",
     "//components/network_time",
     "//components/password_manager/core/browser",
     "//components/password_manager/sync/browser",
     "//components/prefs",
-    "//components/reading_list",
+    "//components/reading_list/core",
+    "//components/reading_list/ios",
     "//components/search_engines",
     "//components/sessions",
     "//components/signin/core/browser",
     "//components/sync",
     "//components/sync_preferences",
     "//components/sync_sessions",
     "//google_apis",
     "//ios/chrome/browser",
     "//ios/chrome/browser/autofill",
     "//ios/chrome/browser/bookmarks",
@@ skipping 65 matching lines @@
   deps = [
     ":sync",
     "//base",
     "//components/browser_sync",
     "//components/sync",
     "//ios/chrome/browser/browser_state:test_support",
     "//ios/web:test_support",
     "//testing/gtest",
   ]
 }