Refactoring DownloadManager::DownloadURL to add proper annotation.

content/browser/background_fetch/background_fetch_test_base.cc

Index: content/browser/background_fetch/background_fetch_test_base.cc
diff --git a/content/browser/background_fetch/background_fetch_test_base.cc b/content/browser/background_fetch/background_fetch_test_base.cc
index 9314f19e96e0d83b7c51618bc1d88b115e0d4e58..f925c748685a397aa5958cb30a8269a274b218fe 100644
--- a/content/browser/background_fetch/background_fetch_test_base.cc
+++ b/content/browser/background_fetch/background_fetch_test_base.cc
@@ -125,7 +125,9 @@ class BackgroundFetchTestBase::RespondingDownloadManager
 
   // Called when the Background Fetch system starts a download, all information
   // for which is contained in the |params|.
-  void DownloadUrl(std::unique_ptr<DownloadUrlParameters> params) override {
+  void DownloadUrl(
+      std::unique_ptr<DownloadUrlParameters> params,
+      const net::NetworkTrafficAnnotationTag& traffic_annotation) override {
     auto iter = registered_responses_.find(params->url());
     if (iter == registered_responses_.end())
       return;