Moving previews code from components/ to chrome/

components/previews/core/previews_ui_service_unittest.cc

Index: components/previews/core/previews_ui_service_unittest.cc
diff --git a/components/previews/core/previews_ui_service_unittest.cc b/components/previews/core/previews_ui_service_unittest.cc
index 57a1bbd8aefd1c14a7c2e872bee7f4f4886ac702..0398ffd73a24632f0cae1987ffe1e74726d12ef3 100644
--- a/components/previews/core/previews_ui_service_unittest.cc
+++ b/components/previews/core/previews_ui_service_unittest.cc
@@ -26,7 +26,8 @@ class TestPreviewsUIService : public PreviewsUIService {
       std::unique_ptr<PreviewsOptOutStore> previews_opt_out_store)
       : PreviewsUIService(previews_io_data,
                           io_task_runner,
-                          std::move(previews_opt_out_store)),
+                          std::move(previews_opt_out_store),
+                          PreviewsIsEnabledCallback()),
         io_data_set_(false) {}
   ~TestPreviewsUIService() override {}