Revert of Introduce SessionManager that will contain code to start user session on Chrome OS

chrome/browser/prefs/browser_prefs.cc

Index: chrome/browser/prefs/browser_prefs.cc
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index 79dc07e03655a536a1abf8d12f1fe100cd553d6e..73928ad2b44e62d56e82f6843fb7ee1b4332eced 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -144,8 +144,8 @@
 #include "chrome/browser/chromeos/file_system_provider/service.h"
 #include "chrome/browser/chromeos/first_run/first_run.h"
 #include "chrome/browser/chromeos/login/default_pinned_apps_field_trial.h"
+#include "chrome/browser/chromeos/login/login_utils.h"
 #include "chrome/browser/chromeos/login/saml/saml_offline_signin_limiter.h"
-#include "chrome/browser/chromeos/login/session/session_manager.h"
 #include "chrome/browser/chromeos/login/startup_utils.h"
 #include "chrome/browser/chromeos/login/users/avatar/user_image_manager.h"
 #include "chrome/browser/chromeos/login/users/avatar/user_image_sync_observer.h"
@@ -170,7 +170,6 @@
 #include "chrome/browser/ui/webui/chromeos/charger_replacement_handler.h"
 #include "chrome/browser/ui/webui/chromeos/login/hid_detection_screen_handler.h"
 #include "chrome/browser/ui/webui/chromeos/login/network_screen_handler.h"
-#include "chrome/browser/ui/webui/chromeos/login/reset_screen_handler.h"
 #include "chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h"
 #else
 #include "chrome/browser/extensions/default_apps.h"
@@ -297,15 +296,14 @@
   chromeos::default_pinned_apps_field_trial::RegisterPrefs(registry);
   chromeos::language_prefs::RegisterPrefs(registry);
   chromeos::KioskAppManager::RegisterPrefs(registry);
+  chromeos::LoginUtils::RegisterPrefs(registry);
   chromeos::MultiProfileUserController::RegisterPrefs(registry);
   chromeos::HIDDetectionScreenHandler::RegisterPrefs(registry);
   chromeos::NetworkScreenHandler::RegisterPrefs(registry);
   chromeos::Preferences::RegisterPrefs(registry);
   chromeos::proxy_config::RegisterPrefs(registry);
   chromeos::RegisterDisplayLocalStatePrefs(registry);
-  chromeos::ResetScreenHandler::RegisterPrefs(registry);
   chromeos::ServicesCustomizationDocument::RegisterPrefs(registry);
-  chromeos::SessionManager::RegisterPrefs(registry);
   chromeos::SigninScreenHandler::RegisterPrefs(registry);
   chromeos::system::AutomaticRebootManager::RegisterPrefs(registry);
   chromeos::UserImageManager::RegisterPrefs(registry);