chromeos: Fix shelf appearing at login screen under mash

chrome/browser/ui/ash/chrome_shell_delegate.cc

Index: chrome/browser/ui/ash/chrome_shell_delegate.cc
diff --git a/chrome/browser/ui/ash/chrome_shell_delegate.cc b/chrome/browser/ui/ash/chrome_shell_delegate.cc
index a452d0a1c341ffe13f1ca5061d30c42b5271c9c1..6bd85d99dbfaa6b066d24cb5f08a38140b4d145e 100644
--- a/chrome/browser/ui/ash/chrome_shell_delegate.cc
+++ b/chrome/browser/ui/ash/chrome_shell_delegate.cc
@@ -573,7 +573,6 @@ void ChromeShellDelegate::Observe(int type,
       // chrome::NOTIFICATION_LOGIN_USER_PROFILE_PREPARED instead.
       if (shelf_delegate_)
         shelf_delegate_->OnUserProfileReadyToSwitch(profile);
-      ash::Shell::GetInstance()->OnLoginUserProfilePrepared();
       break;
     }
     case chrome::NOTIFICATION_SESSION_STARTED:
@@ -581,7 +580,6 @@ void ChromeShellDelegate::Observe(int type,
       // start.
       if (user_manager::UserManager::Get()->GetLoggedInUsers().size() < 2)
         InitAfterFirstSessionStart();
-      ash::WmShell::Get()->ShowShelf();
       break;
     default:
       NOTREACHED() << "Unexpected notification " << type;