Revert of ash/mash: Add a mus-client that sets up ash to provide the system ui for mash.

ash/mus/main.cc

Index: ash/mus/main.cc
diff --git a/ash/mus/main.cc b/ash/mus/main.cc
deleted file mode 100644
index abc410921761ca1f5bbd98366fd117f6fe71036d..0000000000000000000000000000000000000000
--- a/ash/mus/main.cc
+++ /dev/null
@@ -1,12 +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 "ash/mus/sysui_application.h"
-#include "mojo/public/c/system/main.h"
-#include "mojo/shell/public/cpp/application_runner.h"
-
-MojoResult MojoMain(MojoHandle shell_handle) {
-  mojo::ApplicationRunner runner(new ash::sysui::SysUIApplication);
-  return runner.Run(shell_handle);
-}