Fix build with gcc after #313406

chrome/browser/history/in_memory_history_backend.h

Index: chrome/browser/history/in_memory_history_backend.h
diff --git a/chrome/browser/history/in_memory_history_backend.h b/chrome/browser/history/in_memory_history_backend.h
index 0fea8fc8ede65e7a5f364493501576bce7de8c56..4b76c713714e74bbcb33e2f7c7edebcea7733506 100644
--- a/chrome/browser/history/in_memory_history_backend.h
+++ b/chrome/browser/history/in_memory_history_backend.h
@@ -91,9 +91,6 @@ class InMemoryHistoryBackend : public HistoryServiceObserver {
   void OnKeywordSearchTermDeleted(HistoryService* history_service,
                                   URLID url_id) override;
 
- private:
-  FRIEND_TEST_ALL_PREFIXES(HistoryBackendTest, DeleteAll);
-
   // Handler for HISTORY_URL_VISITED and HISTORY_URLS_MODIFIED.
   void OnURLVisitedOrModified(const URLRow& url_row);