Use TaskScheduler instead of blocking pool in io_thread.cc.

chrome/browser/io_thread.cc

 // Copyright (c) 2012 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/io_thread.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/debug/leak_tracker.h"
 #include "base/environment.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
-#include "base/threading/sequenced_worker_pool.h"
+#include "base/task_scheduler/post_task.h"
 #include "base/threading/thread.h"
 #include "base/time/time.h"
 #include "base/trace_event/trace_event.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/data_usage/tab_id_annotator.h"
 #include "chrome/browser/data_use_measurement/chrome_data_use_ascriber.h"
 #include "chrome/browser/net/async_dns_field_trial.h"
 #include "chrome/browser/net/chrome_network_delegate.h"
 #include "chrome/browser/net/dns_probe_service.h"
@@ skipping 1033 matching lines @@
       globals->proxy_script_fetcher_http_transaction_factory.get());
 
   std::unique_ptr<net::URLRequestJobFactoryImpl> job_factory(
       new net::URLRequestJobFactoryImpl());
 
   job_factory->SetProtocolHandler(url::kDataScheme,
                                   base::MakeUnique<net::DataProtocolHandler>());
   job_factory->SetProtocolHandler(
       url::kFileScheme,
       base::MakeUnique<net::FileProtocolHandler>(
-          content::BrowserThread::GetBlockingPool()
-              ->GetTaskRunnerWithShutdownBehavior(
-                  base::SequencedWorkerPool::SKIP_ON_SHUTDOWN)));
+          base::CreateTaskRunnerWithTraits(
+              base::TaskTraits()
+                  .MayBlock()
+                  .WithPriority(base::TaskPriority::USER_VISIBLE)
+                  .WithShutdownBehavior(
+                      base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN))));
 #if !BUILDFLAG(DISABLE_FTP_SUPPORT)
   job_factory->SetProtocolHandler(
       url::kFtpScheme,
       net::FtpProtocolHandler::Create(globals->host_resolver.get()));
 #endif
   globals->proxy_script_fetcher_url_request_job_factory =
       std::move(job_factory);
 
   context->set_job_factory(
       globals->proxy_script_fetcher_url_request_job_factory.get());
 
   // TODO(rtenneti): We should probably use HttpServerPropertiesManager for the
   // system URLRequestContext too. There's no reason this should be tied to a
   // profile.
   return context;
 }
 
 metrics::UpdateUsagePrefCallbackType IOThread::GetMetricsDataUseForwarder() {
   return base::Bind(&UpdateMetricsUsagePrefsOnUIThread);
 }