TaskScheduler: No BACKGROUND threads when unsupported.

base/task_scheduler/scheduler_worker_pool_params.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 "base/task_scheduler/scheduler_worker_pool_params.h"
 
 #include "base/time/time.h"
 
 namespace base {
 
 SchedulerWorkerPoolParams::SchedulerWorkerPoolParams(
     const std::string& name,
-    ThreadPriority thread_priority,
+    ThreadPriority priority_hint,
     IORestriction io_restriction,
     int max_threads,
     const TimeDelta& suggested_reclaim_time)
     : name_(name),
-      thread_priority_(thread_priority),
+      priority_hint_(priority_hint),
       io_restriction_(io_restriction),
       max_threads_(max_threads),
       suggested_reclaim_time_(suggested_reclaim_time) {}
 
 SchedulerWorkerPoolParams::SchedulerWorkerPoolParams(
     SchedulerWorkerPoolParams&& other) = default;
 
 SchedulerWorkerPoolParams& SchedulerWorkerPoolParams::operator=(
     SchedulerWorkerPoolParams&& other) = default;
 
 }  // namespace base