Always use TaskScheduler::InitParams to initialize a TaskScheduler.

base/task_scheduler/scheduler_worker_pool_impl.cc

Index: base/task_scheduler/scheduler_worker_pool_impl.cc
diff --git a/base/task_scheduler/scheduler_worker_pool_impl.cc b/base/task_scheduler/scheduler_worker_pool_impl.cc
index 8843ec1d4a57246fe3fbe5f9addfea0ec9474a7c..891bea0a1cfb4fc41528c1f2a9acdfb45b810363 100644
--- a/base/task_scheduler/scheduler_worker_pool_impl.cc
+++ b/base/task_scheduler/scheduler_worker_pool_impl.cc
@@ -255,7 +255,7 @@ void SchedulerWorkerPoolImpl::Start(const SchedulerWorkerPoolParams& params) {
     // highest index is at the bottom of the idle stack.
     for (int index = params.max_threads() - 1; index >= 0; --index) {
       workers_[index] = make_scoped_refptr(
-          new SchedulerWorker(params.priority_hint(),
+          new SchedulerWorker(priority_hint_,
                               MakeUnique<SchedulerWorkerDelegateImpl>(
                                   this, re_enqueue_sequence_callback_, index),
                               task_tracker_, params.backward_compatibility()));