Revert of Move throttling of background timers into the renderer scheduler

components/scheduler/child/scheduler_helper.cc

 // Copyright 2015 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/scheduler/child/scheduler_helper.h"
 
 #include "base/time/default_tick_clock.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "components/scheduler/base/task_queue_impl.h"
@@ skipping 106 matching lines @@
     task_queue_manager_->RemoveTaskObserver(task_observer);
 }
 
 void SchedulerHelper::SetObserver(Observer* observer) {
   CheckOnValidThread();
   observer_ = observer;
   DCHECK(task_queue_manager_);
   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