Reland of Enable RL by default

ios/chrome/browser/sync/ios_chrome_profile_sync_service_factory_unittest.cc

Index: ios/chrome/browser/sync/ios_chrome_profile_sync_service_factory_unittest.cc
diff --git a/ios/chrome/browser/sync/ios_chrome_profile_sync_service_factory_unittest.cc b/ios/chrome/browser/sync/ios_chrome_profile_sync_service_factory_unittest.cc
index 6bb725a44d7f9c850ca9d1d5b281580d9d84d5d6..a6514e3b010f8c6ec94a97ea9021c690b559f920 100644
--- a/ios/chrome/browser/sync/ios_chrome_profile_sync_service_factory_unittest.cc
+++ b/ios/chrome/browser/sync/ios_chrome_profile_sync_service_factory_unittest.cc
@@ -12,6 +12,7 @@
 #include "base/macros.h"
 #include "components/browser_sync/browser_sync_switches.h"
 #include "components/browser_sync/profile_sync_service.h"
+#include "components/reading_list/core/reading_list_switches.h"
 #include "components/sync/base/model_type.h"
 #include "components/sync/driver/data_type_controller.h"
 #include "ios/chrome/browser/browser_state/test_chrome_browser_state.h"
@@ -45,6 +46,9 @@ class IOSChromeProfileSyncServiceFactoryTest : public testing::Test {
     datatypes.push_back(syncer::PASSWORDS);
     datatypes.push_back(syncer::PREFERENCES);
     datatypes.push_back(syncer::PRIORITY_PREFERENCES);
+    if (reading_list::switches::IsReadingListEnabled()) {
+      datatypes.push_back(syncer::READING_LIST);
+    }
     datatypes.push_back(syncer::SESSIONS);
     datatypes.push_back(syncer::PROXY_TABS);
     datatypes.push_back(syncer::TYPED_URLS);