Move message_center::CustomNotificationView to arc::ArcNotificationView

ui/message_center/views/custom_notification_content_view_delegate.cc

Index: ui/message_center/views/custom_notification_content_view_delegate.cc
diff --git a/ui/message_center/views/custom_notification_content_view_delegate.cc b/ui/message_center/views/custom_notification_content_view_delegate.cc
deleted file mode 100644
index a3ee7cdc76b72f550e3568a5805a2f09fa411e06..0000000000000000000000000000000000000000
--- a/ui/message_center/views/custom_notification_content_view_delegate.cc
+++ /dev/null
@@ -1,18 +0,0 @@
-// 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