Fix auto raw pointer deduction on linux

ui/message_center/notification_list.cc

Index: ui/message_center/notification_list.cc
diff --git a/ui/message_center/notification_list.cc b/ui/message_center/notification_list.cc
index 3bac9c1b1e68aaa155687647cff6bb87034f125e..9a9ed0fa10f350ae2aac41dca1523a99bc77c7d6 100644
--- a/ui/message_center/notification_list.cc
+++ b/ui/message_center/notification_list.cc
@@ -24,7 +24,7 @@ namespace {
 bool ShouldShowNotificationAsPopup(
     const Notification& notification,
     const NotificationBlockers& blockers) {
-  for (const auto& blocker : blockers) {
+  for (auto* blocker : blockers) {
     if (!blocker->ShouldShowNotificationAsPopup(notification))
       return false;
   }