ash: Use SessionController instead of SessionStateDelegate

ash/common/system/tray/system_tray.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 "ash/common/system/tray/system_tray.h"
 
 #include <algorithm>
 #include <map>
 #include <vector>
 
 #include "ash/common/key_event_watcher.h"
 #include "ash/common/login_status.h"
 #include "ash/common/material_design/material_design_controller.h"
-#include "ash/common/session/session_state_delegate.h"
+#include "ash/common/session/session_controller.h"
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/shelf/wm_shelf_util.h"
 #include "ash/common/system/chromeos/audio/tray_audio.h"
 #include "ash/common/system/chromeos/bluetooth/tray_bluetooth.h"
 #include "ash/common/system/chromeos/brightness/tray_brightness.h"
 #include "ash/common/system/chromeos/cast/tray_cast.h"
 #include "ash/common/system/chromeos/enterprise/tray_enterprise.h"
 #include "ash/common/system/chromeos/media_security/multi_profile_media_tray_item.h"
 #include "ash/common/system/chromeos/network/tray_network.h"
 #include "ash/common/system/chromeos/network/tray_vpn.h"
@@ skipping 224 matching lines @@
 
 void SystemTray::Shutdown() {
   DCHECK(web_notification_tray_);
   web_notification_tray_ = nullptr;
 }
 
 void SystemTray::CreateItems(SystemTrayDelegate* delegate) {
   const bool use_md = MaterialDesignController::IsSystemTrayMenuMaterial();
 
   // Create user items for each possible user.
-  int maximum_user_profiles = WmShell::Get()
-                                  ->GetSessionStateDelegate()
-                                  ->GetMaximumNumberOfLoggedInUsers();
+  int maximum_user_profiles =

[James Cook, 2017/03/17 17:14:35]

nit: const

[xiyuan, 2017/03/17 22:52:02]

Done.

+      WmShell::Get()->session_controller()->GetMaximumNumberOfLoggedInUsers();
   for (int i = 0; i < maximum_user_profiles; i++)
     AddTrayItem(base::MakeUnique<TrayUser>(this, i));
 
   // Crucially, this trailing padding has to be inside the user item(s).
   // Otherwise it could be a main axis margin on the tray's box layout.
   AddTrayItem(base::MakeUnique<PaddingTrayItem>());
 
   tray_accessibility_ = new TrayAccessibility(this);
   if (!use_md)
     tray_date_ = new TrayDate(this);
@@ skipping 499 matching lines @@
           .work_area()
           .height();
   if (work_area_height > 0) {
     UMA_HISTOGRAM_CUSTOM_COUNTS(
         "Ash.SystemMenu.PercentageOfWorkAreaHeightCoveredByMenu",
         100 * bubble_view->height() / work_area_height, 1, 300, 100);
   }
 }
 
 }  // namespace ash