[Offline Prefetch] Backoff support for PrefetchBackgroundTask

components/offline_pages/core/prefetch/suggested_articles_observer_unittest.cc

Index: components/offline_pages/core/prefetch/suggested_articles_observer_unittest.cc
diff --git a/components/offline_pages/core/prefetch/suggested_articles_observer_unittest.cc b/components/offline_pages/core/prefetch/suggested_articles_observer_unittest.cc
index 6ed4c1b5805e65729eef922fe7b7c5112a45a41d..de04af682eb057100544ce095912c172a9d41205 100644
--- a/components/offline_pages/core/prefetch/suggested_articles_observer_unittest.cc
+++ b/components/offline_pages/core/prefetch/suggested_articles_observer_unittest.cc
@@ -55,7 +55,8 @@ class TestingPrefetchDispatcher : public PrefetchDispatcher {
 
   void BeginBackgroundTask(
       std::unique_ptr<ScopedBackgroundTask> task) override {}
-  void StopBackgroundTask(ScopedBackgroundTask* task) override {}
+  void StopBackgroundTask() override {}
+  void RequestFinishBackgroundTaskForTest() override {}
 
   std::vector<PrefetchURL> latest_prefetch_urls;
   ClientId last_removed_client_id;