Remove app_remoting.

remoting/webapp/app_remoting/html/ar_dialog.css

Index: remoting/webapp/app_remoting/html/ar_dialog.css
diff --git a/remoting/webapp/app_remoting/html/ar_dialog.css b/remoting/webapp/app_remoting/html/ar_dialog.css
deleted file mode 100644
index 2e8689fa11cf018c2c68f638f44365efaf0f0580..0000000000000000000000000000000000000000
--- a/remoting/webapp/app_remoting/html/ar_dialog.css
+++ /dev/null
@@ -1,15 +0,0 @@
-/* Copyright 2014 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.
- */
-
-.app-remoting .kd-modaldialog {
-  /*
-   * kd-modaldialog uses outline, which doesn't affect the bounding box, and so
-   * doesn't work well when adjusting the window shape.
-   */
-  border: 1px solid gray;
-  /* The layout of modal dialog is managed by remoting.Html5ModalDialog */
-  margin: 0px;
-  position: absolute;
-}