Fix a startup crash from https://crrev.com/5eb3ae10901fa65657abc902910265ab492c5dbf

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

Index: chrome/browser/chromeos/login/session/user_session_manager.cc
diff --git a/chrome/browser/chromeos/login/session/user_session_manager.cc b/chrome/browser/chromeos/login/session/user_session_manager.cc
index 219a1174038bda44694ed1170d9402ecda80aea2..236c38aeabbec729c613752c2783c748a978451b 100644
--- a/chrome/browser/chromeos/login/session/user_session_manager.cc
+++ b/chrome/browser/chromeos/login/session/user_session_manager.cc
@@ -1050,16 +1050,17 @@ void UserSessionManager::UpdateEasyUnlockKeys(const UserContext& user_context) {
         EasyUnlockScreenlockStateHandler::NO_HARDLOCK);
   }
 
+  EasyUnlockKeyManager* key_manager = GetEasyUnlockKeyManager();
   running_easy_unlock_key_ops_ = true;
   if (device_list) {
-    easy_unlock_key_manager_->RefreshKeys(
+    key_manager->RefreshKeys(
         user_context,
         *device_list,
         base::Bind(&UserSessionManager::OnEasyUnlockKeyOpsFinished,
                    AsWeakPtr(),
                    user_context.GetUserID()));
   } else {
-    easy_unlock_key_manager_->RemoveKeys(
+    key_manager->RemoveKeys(
         user_context,
         0,
         base::Bind(&UserSessionManager::OnEasyUnlockKeyOpsFinished,