user_manager: Remove deps on session_manager

chrome/browser/chromeos/login/session/chrome_session_manager.cc

Index: chrome/browser/chromeos/login/session/chrome_session_manager.cc
diff --git a/chrome/browser/chromeos/login/session/chrome_session_manager.cc b/chrome/browser/chromeos/login/session/chrome_session_manager.cc
index 2225291666385dcfb6ccba2a78e3e31ca4fd9440..26fde418705d60e3e7ebb7241cb03b33e5c79d7a 100644
--- a/chrome/browser/chromeos/login/session/chrome_session_manager.cc
+++ b/chrome/browser/chromeos/login/session/chrome_session_manager.cc
@@ -9,6 +9,7 @@
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/sys_info.h"
+#include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/chromeos/app_mode/kiosk_app_launch_error.h"
 #include "chrome/browser/chromeos/app_mode/kiosk_app_manager.h"
 #include "chrome/browser/chromeos/login/session/kiosk_auto_launcher_session_manager_delegate.h"
@@ -20,6 +21,8 @@
 #include "chromeos/cryptohome/cryptohome_parameters.h"
 #include "chromeos/login/user_names.h"
 #include "components/signin/core/account_id/account_id.h"
+#include "components/user_manager/user_manager.h"
+#include "content/public/browser/notification_service.h"
 
 namespace chromeos {
 
@@ -93,4 +96,20 @@ ChromeSessionManager::ChromeSessionManager(
 ChromeSessionManager::~ChromeSessionManager() {
 }
 
+void ChromeSessionManager::SessionStarted() {
+  session_manager::SessionManager::SessionStarted();
+  SetSessionState(session_manager::SessionState::ACTIVE);
+
+  // Notifies UserManager so that it can update login state.
+  user_manager::UserManager* user_manager = user_manager::UserManager::Get();
+  if (user_manager)
+    user_manager->OnSessionStarted();
+
+  content::NotificationService::current()->Notify(
+      chrome::NOTIFICATION_SESSION_STARTED,
+      content::Source<session_manager::SessionManager>(this),
+      content::Details<const user_manager::User>(
+          user_manager->GetActiveUser()));
+}
+
 }  // namespace chromeos