Make Service Worker DB UserData methods accept multiple keys at once

content/browser/background_sync/background_sync_manager.cc

Index: content/browser/background_sync/background_sync_manager.cc
diff --git a/content/browser/background_sync/background_sync_manager.cc b/content/browser/background_sync/background_sync_manager.cc
index f2b6de7fe67e8ad9ffe093b6e12ba3e09133b099..91499c2e1da46057bef1be3236ed7f2d63ab660c 100644
--- a/content/browser/background_sync/background_sync_manager.cc
+++ b/content/browser/background_sync/background_sync_manager.cc
@@ -575,7 +575,7 @@ void BackgroundSyncManager::DisableAndClearDidGetRegistrations(
 
   for (const auto& sw_id_and_regs : user_data) {
     service_worker_context_->ClearRegistrationUserData(
-        sw_id_and_regs.first, kBackgroundSyncUserDataKey,
+        sw_id_and_regs.first, {kBackgroundSyncUserDataKey},
         base::Bind(&BackgroundSyncManager::DisableAndClearManagerClearedOne,
                    weak_ptr_factory_.GetWeakPtr(), barrier_closure));
   }
@@ -722,7 +722,7 @@ void BackgroundSyncManager::StoreDataInBackend(
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   service_worker_context_->StoreRegistrationUserData(
-      sw_registration_id, origin, backend_key, data, callback);
+      sw_registration_id, origin, {{backend_key, data}}, callback);
 }
 
 void BackgroundSyncManager::GetDataFromBackend(