Update TaskTraits in user_session_manager.cc.

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 <stddef.h>
 
 #include <set>
 #include <string>
@@ skipping 550 matching lines @@
     // Read brand code asynchronously from an OEM data and repost ourselves.
     google_brand::chromeos::InitBrand(
         base::Bind(&UserSessionManager::InitRlz, AsWeakPtr(), profile));
     return;
   }
   base::PostTaskWithTraitsAndReplyWithResult(
       FROM_HERE, base::TaskTraits()
                      .WithShutdownBehavior(
                          base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN)
                      .WithPriority(base::TaskPriority::BACKGROUND)
-                     .WithFileIO(),
+                     .MayBlock(),
       base::Bind(&base::PathExists, GetRlzDisabledFlagPath()),
       base::Bind(&UserSessionManager::InitRlzImpl, AsWeakPtr(), profile));
 #endif
 }
 
 void UserSessionManager::SetFirstLoginPrefs(
     Profile* profile,
     const std::string& public_session_locale,
     const std::string& public_session_input_method) {
   VLOG(1) << "Setting first login prefs";
@@ skipping 1257 matching lines @@
           ->browser_policy_connector_chromeos()
           ->IsEnterpriseManaged()) {
     return false;
   }
 
   // Do not show end of life notification if this is a guest session
   return !profile->IsGuestSession();
 }
 
 }  // namespace chromeos