Revert of Move throttling of background timers into the renderer scheduler

components/scheduler/child/scheduler_helper.cc

Index: components/scheduler/child/scheduler_helper.cc
diff --git a/components/scheduler/child/scheduler_helper.cc b/components/scheduler/child/scheduler_helper.cc
index 793f2599bf3931c1987a89e5aa22e25c6af710ab..f4081fde958130a00da733500bc63f0b8f37256c 100644
--- a/components/scheduler/child/scheduler_helper.cc
+++ b/components/scheduler/child/scheduler_helper.cc
@@ -124,28 +124,16 @@
   task_queue_manager_->SetObserver(this);
 }
 
-RealTimeDomain* SchedulerHelper::real_time_domain() const {
-  CheckOnValidThread();
-  DCHECK(task_queue_manager_);
-  return task_queue_manager_->real_time_domain();
-}
-
-void SchedulerHelper::RegisterTimeDomain(TimeDomain* time_domain) {
-  CheckOnValidThread();
-  DCHECK(task_queue_manager_);
-  task_queue_manager_->RegisterTimeDomain(time_domain);
-}
-
-void SchedulerHelper::UnregisterTimeDomain(TimeDomain* time_domain) {
-  CheckOnValidThread();
-  if (task_queue_manager_)
-    task_queue_manager_->UnregisterTimeDomain(time_domain);
-}
-
 void SchedulerHelper::OnUnregisterTaskQueue(
     const scoped_refptr<internal::TaskQueueImpl>& queue) {
   if (observer_)
     observer_->OnUnregisterTaskQueue(queue);
 }
 
+const scoped_refptr<RealTimeDomain>& SchedulerHelper::real_time_domain() const {
+  CheckOnValidThread();
+  DCHECK(task_queue_manager_);
+  return task_queue_manager_->real_time_domain();
+}
+
 }  // namespace scheduler