Fix sync for reading list

components/browser_sync/profile_sync_service.cc

Index: components/browser_sync/profile_sync_service.cc
diff --git a/components/browser_sync/profile_sync_service.cc b/components/browser_sync/profile_sync_service.cc
index 0b436ed1d1bb8b7df51f3c27c0ed7a4d0bb1b717..3ba611bf79e457c3a3115d63fc6c3db15e75acde 100644
--- a/components/browser_sync/profile_sync_service.cc
+++ b/components/browser_sync/profile_sync_service.cc
@@ -1659,6 +1659,7 @@ void ProfileSyncService::UpdateSelectedTypesHistogram(
           syncer::user_selectable_type::TYPED_URLS,
           syncer::user_selectable_type::EXTENSIONS,
           syncer::user_selectable_type::APPS,
+          syncer::user_selectable_type::READING_LIST,
           syncer::user_selectable_type::PROXY_TABS,
       };