[cros] Define session_manager component with SessionManager base class

chrome/browser/chromeos/chrome_browser_main_chromeos.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_CHROME_BROWSER_MAIN_CHROMEOS_H_
 #define CHROME_BROWSER_CHROMEOS_CHROME_BROWSER_MAIN_CHROMEOS_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/task/cancelable_task_tracker.h"
 #include "chrome/browser/chrome_browser_main_linux.h"
 #include "chrome/browser/chromeos/external_metrics.h"
 #include "chrome/browser/chromeos/version_loader.h"
 
 namespace content {
 class PowerSaveBlocker;
 }
 
+namespace session_manager {
+class SessionManager;
+}
+
 namespace chromeos {
 
 class DataPromoNotification;
 class EventRewriter;
 class EventRewriterController;
 class ExtensionSystemEventObserver;
 class IdleActionWarningObserver;
 class MagnificationManager;
 class PeripheralBatteryObserver;
 class PowerButtonObserver;
@@ skipping 35 matching lines @@
   scoped_ptr<ExtensionSystemEventObserver> extension_system_event_observer_;
   scoped_ptr<PeripheralBatteryObserver> peripheral_battery_observer_;
   scoped_ptr<PowerPrefs> power_prefs_;
   scoped_ptr<PowerButtonObserver> power_button_observer_;
   scoped_ptr<content::PowerSaveBlocker> retail_mode_power_save_blocker_;
   scoped_ptr<IdleActionWarningObserver> idle_action_warning_observer_;
   scoped_ptr<DataPromoNotification> data_promo_notification_;
 
   scoped_ptr<internal::DBusServices> dbus_services_;
 
+  scoped_ptr<session_manager::SessionManager> session_manager_;
+
   scoped_ptr<EventRewriterController> keyboard_event_rewriters_;
 
   scoped_refptr<chromeos::ExternalMetrics> external_metrics_;
 
   VersionLoader cros_version_loader_;
   base::CancelableTaskTracker tracker_;
   bool use_new_network_change_notifier_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainPartsChromeos);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_CHROME_BROWSER_MAIN_CHROMEOS_H_