Reland of Change the update_client task runner behavior to continue on shutdown.

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 105 matching lines @@
 }
 
 bool ChromeConfigurator::DeltasEnabled() const {
   return configurator_impl_.DeltasEnabled();
 }
 
 bool ChromeConfigurator::UseBackgroundDownloader() const {
   return configurator_impl_.UseBackgroundDownloader();
 }
 
+// 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::SKIP_ON_SHUTDOWN);
+          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