mustash: Connect ash system tray "show settings" items to chrome over mojo

ash/common/system/chromeos/supervised/tray_supervised_user.cc

 // 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.
 
 #include "ash/common/system/chromeos/supervised/tray_supervised_user.h"
 
 #include <utility>
 
 #include "ash/common/login_status.h"
 #include "ash/common/system/system_notifier.h"
@@ skipping 51 matching lines @@
   tray_view_ = new LabelTrayView(this, GetSupervisedUserIconId());
   UpdateMessage();
   return tray_view_;
 }
 
 void TraySupervisedUser::DestroyDefaultView() {
   tray_view_ = NULL;
 }
 
 void TraySupervisedUser::OnViewClicked(views::View* sender) {
-  WmShell::Get()->system_tray_delegate()->ShowSupervisedUserInfo();
+  // TODO(antrim): find out what should we show in this case.

[msw, 2016/09/27 20:14:33]

nit: cc antrim? remove/update bug citation (it's closed...)

[James Cook, 2016/09/27 20:48:58]

Removed the bug number and pinged the bug + kuscher. antrim doesn't work on
chrome anymore.

+  // http://crbug.com/229762
 }
 
 void TraySupervisedUser::UpdateAfterLoginStatusChange(LoginStatus status) {
   SystemTrayDelegate* delegate = WmShell::Get()->system_tray_delegate();
 
   bool is_user_supervised = delegate->IsUserSupervised();
   if (status == status_ && is_user_supervised == is_user_supervised_)
     return;
 
   if (is_user_supervised && !delegate->IsUserChild() &&
@@ skipping 41 matching lines @@
 
   // Not intended to be used for non-supervised users.
   CHECK(delegate->IsUserSupervised());
 
   if (delegate->IsUserChild())
     return IDR_AURA_UBER_TRAY_CHILD_USER;
   return IDR_AURA_UBER_TRAY_SUPERVISED_USER;
 }
 
 }  // namespace ash