Transfer responsibility for providing a close button for a notification to each implementation of M…

ui/message_center/views/custom_notification_content_view_delegate.cc

+// Copyright 2016 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 "ui/message_center/views/custom_notification_content_view_delegate.h"
+
+#include "ui/views/view.h"
+
+namespace message_center {
+
+CustomContent::CustomContent(
+    std::unique_ptr<views::View> view,
+    std::unique_ptr<CustomNotificationContentViewDelegate> delegate)
+    : view(std::move(view)), delegate(std::move(delegate)) {}
+
+CustomContent::~CustomContent() {}
+
+}  // namespace message_center