UserManager refactoring: move active user session restoration to UserSessionManager.

chrome/browser/chromeos/chrome_browser_main_chromeos.cc

Index: chrome/browser/chromeos/chrome_browser_main_chromeos.cc
diff --git a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
index 30b4ede6eeb64e385085e82edd64c327a1697c43..04b761370f78d61d60ac80b5c31d7e05e67f54f0 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
@@ -590,7 +590,7 @@ void ChromeBrowserMainPartsChromeos::PostProfileInit() {
     // First user has been already marked as logged in and active in
     // PreProfileInit(). Chrome should tread other user in a session as active
     // in the background.
-    UserManager::Get()->RestoreActiveSessions();
+    UserSessionManager::GetInstance()->RestoreActiveSessions();
   }
 
   // Initialize the network portal detector for Chrome OS. The network