Add ShellDelegate, MediaDelegate and KeyboardUI stubs to mus ash

ash/sysui/shell_delegate_mus.cc

 // 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/sysui/shell_delegate_mus.h"
 
 #include "ash/common/default_accessibility_delegate.h"
+#include "ash/common/gpu_support_stub.h"
 #include "ash/common/media_delegate.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/system/tray/default_system_tray_delegate.h"
-#include "ash/gpu_support_stub.h"
 #include "ash/sysui/app_list_presenter_mus.h"
 #include "ash/sysui/context_menu_mus.h"
 #include "ash/sysui/pointer_watcher_delegate_mus.h"
 #include "ash/sysui/shelf_delegate_mus.h"
 #include "ash/sysui/user_wallpaper_delegate_mus.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/string16.h"
 #include "components/user_manager/user_info_impl.h"
 #include "ui/app_list/presenter/app_list_presenter.h"
 #include "ui/gfx/image/image.h"
@@ skipping 193 matching lines @@
   return base::string16();
 }
 
 gfx::Image ShellDelegateMus::GetDeprecatedAcceleratorImage() const {
   NOTIMPLEMENTED();
   return gfx::Image();
 }
 
 }  // namespace sysui
 }  // namespace ash