Revert of Move throttling of background timers into the renderer scheduler

components/scheduler/base/real_time_domain.h

 // 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.
 
 #ifndef COMPONENTS_SCHEDULER_BASE_REAL_TIME_DOMAIN_H_
 #define COMPONENTS_SCHEDULER_BASE_REAL_TIME_DOMAIN_H_
 
 #include <set>
 
 #include "base/macros.h"
 #include "components/scheduler/base/time_domain.h"
 #include "components/scheduler/scheduler_export.h"
 
 namespace scheduler {
 class TaskQueueManagerDelegate;
 
 class SCHEDULER_EXPORT RealTimeDomain : public TimeDomain {
  public:
   RealTimeDomain();
-  ~RealTimeDomain() override;
 
   // TimeDomain implementation:
   LazyNow CreateLazyNow() override;
   bool MaybeAdvanceTime() override;
   const char* GetName() const override;
 
  protected:
   void OnRegisterWithTaskQueueManager(
       TaskQueueManagerDelegate* task_queue_manager_delegate,
       base::Closure do_work_closure) override;
   void RequestWakeup(LazyNow* lazy_now, base::TimeDelta delay) override;
   void AsValueIntoInternal(
       base::trace_event::TracedValue* state) const override;
 
  private:
   void PostWrappedDoWork(base::TimeTicks now, base::TimeTicks run_time);
   void WrappedDoWorkTask(base::TimeTicks run_time);
 
   TaskQueueManagerDelegate* task_queue_manager_delegate_;  // NOT OWNED
   std::set<base::TimeTicks> pending_wakeups_;
   base::Closure do_work_closure_;
   base::WeakPtrFactory<RealTimeDomain> weak_factory_;
 
+  ~RealTimeDomain() override;
+
   DISALLOW_COPY_AND_ASSIGN(RealTimeDomain);
 };
 
 }  // namespace scheduler
 
 #endif  // COMPONENTS_SCHEDULER_BASE_REAL_TIME_DOMAIN_H_