Add LoginState class to src/chromeos/login

chrome/browser/chromeos/extensions/file_browser_event_router.cc

Index: chrome/browser/chromeos/extensions/file_browser_event_router.cc
diff --git a/chrome/browser/chromeos/extensions/file_browser_event_router.cc b/chrome/browser/chromeos/extensions/file_browser_event_router.cc
index 40b4cf76e1f816676aeec19160a1c293f1283425..0659d19db22f7173936f05491ac512b438e4e6be 100644
--- a/chrome/browser/chromeos/extensions/file_browser_event_router.cc
+++ b/chrome/browser/chromeos/extensions/file_browser_event_router.cc
@@ -20,7 +20,6 @@
 #include "chrome/browser/chromeos/extensions/file_manager_util.h"
 #include "chrome/browser/chromeos/login/base_login_display_host.h"
 #include "chrome/browser/chromeos/login/screen_locker.h"
-#include "chrome/browser/chromeos/login/user_manager.h"
 #include "chrome/browser/chromeos/net/connectivity_state_helper.h"
 #include "chrome/browser/extensions/event_names.h"
 #include "chrome/browser/extensions/event_router.h"
@@ -34,6 +33,7 @@
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/power_manager_client.h"
 #include "chromeos/dbus/session_manager_client.h"
+#include "chromeos/login/login_state.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_source.h"
 #include "grit/generated_resources.h"
@@ -296,7 +296,7 @@ void FileBrowserEventRouter::ObserveFileSystemEvents() {
     NOTREACHED();
     return;
   }
-  if (!chromeos::UserManager::Get()->IsUserLoggedIn())
+  if (!chromeos::LoginState::Get()->IsUserLoggedIn())
     return;
 
   DiskMountManager* disk_mount_manager = DiskMountManager::GetInstance();