Get signals working in the EXTRA_DATA section of MHTML

chrome/browser/android/offline_pages/offline_page_bridge.cc

Index: chrome/browser/android/offline_pages/offline_page_bridge.cc
diff --git a/chrome/browser/android/offline_pages/offline_page_bridge.cc b/chrome/browser/android/offline_pages/offline_page_bridge.cc
index 2661b852181505c30741a3229c6ffd8d9c8515f9..3e0bb37f3a317cc62c732e0b916c0627ba819105 100644
--- a/chrome/browser/android/offline_pages/offline_page_bridge.cc
+++ b/chrome/browser/android/offline_pages/offline_page_bridge.cc
@@ -447,8 +447,10 @@ void OfflinePageBridge::SavePage(
   save_page_params.client_id.id = ConvertJavaStringToUTF8(env, j_client_id);
   save_page_params.is_background = false;
 
+  std::vector<std::string> signal_data;
+
   offline_page_model_->SavePage(
-      save_page_params, std::move(archiver),
+      save_page_params, std::move(archiver), signal_data,
       base::Bind(&SavePageCallback, j_callback_ref, save_page_params.url));
 }