chromeos: Fix shelf appearing at login screen under mash

chrome/browser/ui/ash/chrome_shell_delegate.cc

 // Copyright (c) 2012 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 "chrome/browser/ui/ash/chrome_shell_delegate.h"
 
 #include <stddef.h>
 
 #include <limits>
 
@@ skipping 545 matching lines @@
           !profile->IsGuestSession() && !profile->IsSupervised()) {
         // Start the error notifier services to show auth/sync notifications.
         SigninErrorNotifierFactory::GetForProfile(profile);
         SyncErrorNotifierFactory::GetForProfile(profile);
       }
       // Do not use chrome::NOTIFICATION_PROFILE_ADDED because the
       // profile is not fully initialized by user_manager.  Use
       // chrome::NOTIFICATION_LOGIN_USER_PROFILE_PREPARED instead.
       if (shelf_delegate_)
         shelf_delegate_->OnUserProfileReadyToSwitch(profile);
-      ash::Shell::GetInstance()->OnLoginUserProfilePrepared();

[James Cook, 2016/12/16 01:28:27]

This is the core of the change. The shelf is created a little later, in response
to the session starting, using code that is the same in classic ash and mash.

       break;
     }
     case chrome::NOTIFICATION_SESSION_STARTED:
       // InitAfterFirstSessionStart() should only be called once upon system
       // start.
       if (user_manager::UserManager::Get()->GetLoggedInUsers().size() < 2)
         InitAfterFirstSessionStart();
-      ash::WmShell::Get()->ShowShelf();
       break;
     default:
       NOTREACHED() << "Unexpected notification " << type;
   }
 }
 
 void ChromeShellDelegate::PlatformInit() {
   registrar_.Add(this, chrome::NOTIFICATION_LOGIN_USER_PROFILE_PREPARED,
                  content::NotificationService::AllSources());
   registrar_.Add(this, chrome::NOTIFICATION_SESSION_STARTED,
                  content::NotificationService::AllSources());
 }