Fix build error with gcc 4.8.2 about WARN_UNUSED_RESULT

chrome/browser/component_updater/chrome_component_updater_configurator.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/component_updater/chrome_component_updater_configurator.h"
 
 #include <string>
 #include <vector>
 
 #include "base/threading/sequenced_worker_pool.h"
@@ skipping 113 matching lines @@
 }
 
 // Returns a task runner to run blocking tasks. The task runner continues to run
 // after the browser shuts down, until the OS terminates the process. This
 // imposes certain requirements for the code using the task runner, such as
 // not accessing any global browser state while the code is running.
 scoped_refptr<base::SequencedTaskRunner>
 ChromeConfigurator::GetSequencedTaskRunner() const {
   return content::BrowserThread::GetBlockingPool()
       ->GetSequencedTaskRunnerWithShutdownBehavior(
-          content::BrowserThread::GetBlockingPool()->GetSequenceToken(),
+          base::SequencedWorkerPool::GetSequenceToken(),
           base::SequencedWorkerPool::CONTINUE_ON_SHUTDOWN);
 }
 
 }  // namespace
 
 scoped_refptr<update_client::Configurator>
 MakeChromeComponentUpdaterConfigurator(
     const base::CommandLine* cmdline,
     net::URLRequestContextGetter* context_getter) {
   return new ChromeConfigurator(cmdline, context_getter);
 }
 
 }  // namespace component_updater