Refactor MessageCenterSettingsController.

chrome/browser/notifications/notifier_source.cc

Index: chrome/browser/notifications/notifier_source.cc
diff --git a/chrome/browser/notifications/notifier_source.cc b/chrome/browser/notifications/notifier_source.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e6892a8a46557b7fa53893e29947dc43f9dfadb7
--- /dev/null
+++ b/chrome/browser/notifications/notifier_source.cc
@@ -0,0 +1,14 @@
+// Copyright (c) 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 "chrome/browser/notifications/notifier_source.h"
+
+NotifierSource::NotifierSource(message_center::NotifierSettingsObserver* parent)
+    : parent_(parent) {
+  DCHECK(parent_);
+}
+
+NotifierSource::~NotifierSource() {}
+
+void NotifierSource::OnNotifierSettingsClosing() {}