Migrate extension notifications to the new NotificationDisplayService

chrome/browser/extensions/api/notifications/extension_notification_display_helper_factory.h

Index: chrome/browser/extensions/api/notifications/extension_notification_display_helper_factory.h
diff --git a/chrome/browser/extensions/api/notifications/extension_notification_display_helper_factory.h b/chrome/browser/extensions/api/notifications/extension_notification_display_helper_factory.h
new file mode 100644
index 0000000000000000000000000000000000000000..ee3eeec683e0e640451f35cddfa7d1b627b01103
--- /dev/null
+++ b/chrome/browser/extensions/api/notifications/extension_notification_display_helper_factory.h
@@ -0,0 +1,44 @@
+// 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 "base/macros.h"
+#include "base/memory/singleton.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+#ifndef CHROME_BROWSER_EXTENSIONS_API_NOTIFICATIONS_EXTENSION_NOTIFICATION_DISPLAY_HELPER_FACTORY_H_
+#define CHROME_BROWSER_EXTENSIONS_API_NOTIFICATIONS_EXTENSION_NOTIFICATION_DISPLAY_HELPER_FACTORY_H_
+
+class Profile;
+
+namespace extensions {
+
+class ExtensionNotificationDisplayHelper;
+
+class ExtensionNotificationDisplayHelperFactory
+    : public BrowserContextKeyedServiceFactory {
+ public:
+  // Get the singleton instance of the factory.
+  static ExtensionNotificationDisplayHelperFactory* GetInstance();
+
+  // Get the display helper for |profile|, creating one if needed.
+  static ExtensionNotificationDisplayHelper* GetForProfile(Profile* profile);
+
+ protected:
+  // Overridden from BrowserContextKeyedServiceFactory.
+  KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* context) const override;
+
+ private:
+  friend struct base::DefaultSingletonTraits<
+      ExtensionNotificationDisplayHelperFactory>;
+
+  ExtensionNotificationDisplayHelperFactory();
+  ~ExtensionNotificationDisplayHelperFactory() override;
+
+  DISALLOW_COPY_AND_ASSIGN(ExtensionNotificationDisplayHelperFactory);
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_NOTIFICATIONS_EXTENSION_NOTIFICATION_DISPLAY_HELPER_FACTORY_H_
+
+}  // namespace extensions