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

mash/shell/shell_application_delegate.h

 // Copyright 2015 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.
 
 #ifndef MASH_SHELL_SHELL_APPLICATION_DELEGATE_H_
 #define MASH_SHELL_SHELL_APPLICATION_DELEGATE_H_
 
 #include <map>
 
 #include "base/callback.h"
@@ skipping 30 matching lines @@
   void AddScreenlockStateListener(
       mojom::ScreenlockStateListenerPtr listener) override;
   void LockScreen() override;
   void UnlockScreen() override;
 
   // mojo::InterfaceFactory<mash::shell::mojom::Shell>:
   void Create(mojo::Connection* connection,
               mojo::InterfaceRequest<mash::shell::mojom::Shell> r) override;
 
   void StartWindowManager();
-  void StartSystemUI();
   void StartWallpaper();
   void StartShelf();
   void StartBrowserDriver();
   void StartQuickLaunch();
 
   void StartScreenlock();
   void StopScreenlock();
 
   // Starts the application at |url|, running |restart_callback| if the
   // connection to the application is closed.
   void StartRestartableService(const std::string& url,
                                const base::Closure& restart_callback);
 
   mojo::Shell* shell_;
   std::map<std::string, scoped_ptr<mojo::Connection>> connections_;
   bool screen_locked_;
   mojo::WeakBindingSet<mash::shell::mojom::Shell> bindings_;
   mojo::WeakInterfacePtrSet<mojom::ScreenlockStateListener>
       screenlock_listeners_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellApplicationDelegate);
 };
 
 }  // namespace shell
 }  // namespace mash
 
 #endif  // MASH_SHELL_SHELL_APPLICATION_DELEGATE_H_