Remove TaskTraits::with_file_io().

components/task_scheduler_util/browser/initialization.cc

 // Copyright 2016 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 "components/task_scheduler_util/browser/initialization.h"
 
 #include <map>
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 42 matching lines @@
   DCHECK_EQ(FOREGROUND_FILE_IO, constant_worker_pool_params.size());
   constant_worker_pool_params.emplace_back("ForegroundFileIO",
                                            ThreadPriority::NORMAL);
 
   return GetWorkerPoolParams(constant_worker_pool_params, variation_params);
 }
 
 size_t BrowserWorkerPoolIndexForTraits(const base::TaskTraits& traits) {
   const bool is_background =
       traits.priority() == base::TaskPriority::BACKGROUND;
-  if (traits.with_file_io())
+  if (traits.may_block() || traits.with_base_sync_primitives())
     return is_background ? BACKGROUND_FILE_IO : FOREGROUND_FILE_IO;
   return is_background ? BACKGROUND : FOREGROUND;
 }
 
 void MaybePerformBrowserTaskSchedulerRedirection() {
   // TODO(gab): Remove this when http://crbug.com/622400 concludes.
   if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kDisableBrowserTaskScheduler) &&
       variations::GetVariationParamValue(
           kFieldTrialName, "RedirectSequencedWorkerPools") == "true") {
     const base::TaskPriority max_task_priority =
         variations::GetVariationParamValue(
             kFieldTrialName, "CapSequencedWorkerPoolsAtUserVisible") == "true"
             ? base::TaskPriority::USER_VISIBLE
             : base::TaskPriority::HIGHEST;
     base::SequencedWorkerPool::EnableWithRedirectionToTaskSchedulerForProcess(
         max_task_priority);
   }
 }
 
 }  // namespace task_scheduler_util