Get signals working in the EXTRA_DATA section of MHTML

components/offline_pages/core/offline_page_model_impl_unittest.cc

Index: components/offline_pages/core/offline_page_model_impl_unittest.cc
diff --git a/components/offline_pages/core/offline_page_model_impl_unittest.cc b/components/offline_pages/core/offline_page_model_impl_unittest.cc
index b5806b222b7a343c8cf21ba5e3c43916eff73ef0..384cb879b0463fc9437173ce629b33c6122b2ef2 100644
--- a/components/offline_pages/core/offline_page_model_impl_unittest.cc
+++ b/components/offline_pages/core/offline_page_model_impl_unittest.cc
@@ -328,9 +328,9 @@ OfflinePageTestStore* OfflinePageModelImplTest::GetStore() {
 void OfflinePageModelImplTest::SavePageWithParamsAsync(
     const OfflinePageModel::SavePageParams& save_page_params,
     std::unique_ptr<OfflinePageArchiver> archiver) {
+  std::string signal_data;
   model()->SavePage(
-      save_page_params,
-      std::move(archiver),
+      save_page_params, std::move(archiver), signal_data,
       base::Bind(&OfflinePageModelImplTest::OnSavePageDone, AsWeakPtr()));
 }