Move ash/system/web_notification message_center to ui/

ash/system/web_notification/web_notification.cc

Index: ash/system/web_notification/web_notification.cc
diff --git a/ash/system/web_notification/web_notification.cc b/ash/system/web_notification/web_notification.cc
deleted file mode 100644
index 9390d18ac2a1471c4879c6424d69171595caf9d1..0000000000000000000000000000000000000000
--- a/ash/system/web_notification/web_notification.cc
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright (c) 2012 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 "ash/system/web_notification/web_notification.h"
-
-namespace message_center {
-
-WebNotification::WebNotification() : is_read(false),
-                                     shown_as_popup(false) {
-}
-
-WebNotification::~WebNotification() {
-}
-
-}  // namespace message_center