Add support for native extension notifications

chrome/browser/extensions/api/notifications/extension_notification_display_helper.cc

Index: chrome/browser/extensions/api/notifications/extension_notification_display_helper.cc
diff --git a/chrome/browser/extensions/api/notifications/extension_notification_display_helper.cc b/chrome/browser/extensions/api/notifications/extension_notification_display_helper.cc
index f6f507d6034c282fc4cfa38829e0b9b9cf2593eb..2882b2102336fbe773c4ab72566ba0bfe3850bd3 100644
--- a/chrome/browser/extensions/api/notifications/extension_notification_display_helper.cc
+++ b/chrome/browser/extensions/api/notifications/extension_notification_display_helper.cc
@@ -80,10 +80,11 @@ bool ExtensionNotificationDisplayHelper::Close(
 }
 
 void ExtensionNotificationDisplayHelper::Shutdown() {
-  for (const std::unique_ptr<Notification>& notification : notifications_) {
-    GetDisplayService()->Close(NotificationCommon::EXTENSION,
-                               notification->delegate_id());
-  }
+  // Do not call GetDisplayService()->Close() here.
+  // This is called upon profile destruction and closing a notification
+  // requires a profile. Both the message center and the bridge
+  // notificatiosn will clean up notifications upon exit so all
+  // that is needed here is cleaning up the internal state.
 
   notifications_.clear();
 }