session_manager: Create ChromeSessionManager early

chrome/browser/chromeos/login/ui/login_display_host_impl.cc

 // Copyright 2014 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/chromeos/login/ui/login_display_host_impl.h"
 
 #include <utility>
 #include <vector>
 
 #include "ash/common/wallpaper/wallpaper_controller.h"
@@ skipping 1256 matching lines @@
         prefs->GetBoolean(prefs::kOwnerPrimaryMouseButtonRight));
     system::InputDeviceSettings::Get()->SetTapToClick(
         prefs->GetBoolean(prefs::kOwnerTapToClickEnabled));
   }
   system::InputDeviceSettings::Get()->SetNaturalScroll(
       base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kNaturalScrollDefault));
 
   gfx::Rect screen_bounds(chromeos::CalculateScreenBounds(gfx::Size()));
 
-  g_browser_process->platform_part()->SessionManager()->SetSessionState(
+  session_manager::SessionManager::Get()->SetSessionState(
       StartupUtils::IsOobeCompleted()
           ? session_manager::SessionState::LOGIN_PRIMARY
           : session_manager::SessionState::OOBE);
 
   LoginDisplayHostImpl* display_host = new LoginDisplayHostImpl(screen_bounds);
 
   bool show_app_launch_splash_screen =
       (first_screen_name == WizardController::kAppLaunchSplashScreenName);
   if (show_app_launch_splash_screen) {
     const std::string& auto_launch_app_id =
@@ skipping 79 matching lines @@
 
   locale_util::SwitchLanguageCallback callback(
       base::Bind(&OnLanguageSwitchedCallback, base::Passed(std::move(data))));
 
   // Load locale keyboards here. Hardware layout would be automatically enabled.
   locale_util::SwitchLanguage(locale, true, true /* login_layouts_only */,
                               callback, ProfileManager::GetActiveUserProfile());
 }
 
 }  // namespace chromeos