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

chrome/browser/chromeos/login/session/user_session_manager.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/session/user_session_manager.h"
 
 #include <string>
 
 #include "base/base_paths.h"
 #include "base/bind.h"
@@ skipping 1032 matching lines @@
     return;
 
   const base::ListValue* device_list = NULL;
   EasyUnlockService* easy_unlock_service = EasyUnlockService::GetForUser(*user);
   if (easy_unlock_service) {
     device_list = easy_unlock_service->GetRemoteDevices();
     easy_unlock_service->SetHardlockState(
         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,
                    AsWeakPtr(),
                    user_context.GetUserID()));
   }
 }
 
 void UserSessionManager::OnEasyUnlockKeyOpsFinished(
     const std::string& user_id,
@@ skipping 35 matching lines @@
 }
 
 EasyUnlockKeyManager* UserSessionManager::GetEasyUnlockKeyManager() {
   if (!easy_unlock_key_manager_)
     easy_unlock_key_manager_.reset(new EasyUnlockKeyManager);
 
   return easy_unlock_key_manager_.get();
 }
 
 }  // namespace chromeos