Replace unique_ptr.reset/release with std::move under src/extensions

extensions/browser/api/alarms/alarm_manager.cc

Index: extensions/browser/api/alarms/alarm_manager.cc
diff --git a/extensions/browser/api/alarms/alarm_manager.cc b/extensions/browser/api/alarms/alarm_manager.cc
index 626c4ce6698f2650ae73c8f28f8ceb788c02c750..7b4cc11e636d347d301dcf2481e994d9743b8d4e 100644
--- a/extensions/browser/api/alarms/alarm_manager.cc
+++ b/extensions/browser/api/alarms/alarm_manager.cc
@@ -309,7 +309,7 @@ void AlarmManager::WriteToStorage(const std::string& extension_id) {
   if (list != alarms_.end())
     alarms = AlarmsToValue(list->second);
   else
-    alarms.reset(AlarmsToValue(AlarmList()).release());
+    alarms = AlarmsToValue(AlarmList());
   storage->SetExtensionValue(extension_id, kRegisteredAlarms,
                              std::move(alarms));
 }