Migrate extension notifications to the new NotificationDisplayService

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

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/extensions/api/notifications/extension_notification_handler.h"
+
+#include "base/logging.h"
+
+ExtensionNotificationHandler::ExtensionNotificationHandler() = default;
+
+ExtensionNotificationHandler::~ExtensionNotificationHandler() = default;
+
+void ExtensionNotificationHandler::OnClose(Profile* profile,
+                                           const std::string& origin,
+                                           const std::string& notification_id,
+                                           bool by_user) {
+  // TODO(peter): Call EraseDataForNotificationId from here once this event
+  // can be relied upon. (It's only been implemented for native NDSes.)
+}
+
+void ExtensionNotificationHandler::OnClick(
+    Profile* profile,
+    const std::string& origin,
+    const std::string& notification_id,
+    int action_index,
+    const base::NullableString16& reply) {}
+
+void ExtensionNotificationHandler::OpenSettings(Profile* profile) {
+  // Extension notifications don't display a settings button.
+  NOTREACHED();
+}
+
+void ExtensionNotificationHandler::RegisterNotification(
+    const std::string& notification_id,
+    NotificationDelegate* delegate) {}