Remove SchedulerWorkerPoolImpl::ReEnqueueSequenceCallback.

base/task_scheduler/task_scheduler_impl.h

 // 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.
 
 #ifndef BASE_TASK_SCHEDULER_TASK_SCHEDULER_IMPL_H_
 #define BASE_TASK_SCHEDULER_TASK_SCHEDULER_IMPL_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 60 matching lines @@
 
  private:
   explicit TaskSchedulerImpl(const std::string& name);
 
   void Initialize(const TaskScheduler::InitParams& init_params);
 
   // Returns the worker pool that runs Tasks with |traits|.
   SchedulerWorkerPoolImpl* GetWorkerPoolForTraits(
       const TaskTraits& traits) const;
 
-  // Callback invoked when a non-single-thread |sequence| isn't empty after a
-  // worker pops a Task from it.
-  void ReEnqueueSequenceCallback(scoped_refptr<Sequence> sequence);
-
   const std::string name_;
   Thread service_thread_;
   std::unique_ptr<TaskTracker> task_tracker_;
   std::unique_ptr<DelayedTaskManager> delayed_task_manager_;
   std::unique_ptr<SchedulerSingleThreadTaskRunnerManager>
       single_thread_task_runner_manager_;
   std::unique_ptr<SchedulerWorkerPoolImpl> worker_pools_[4];
 
 #if DCHECK_IS_ON()
   // Set once JoinForTesting() has returned.
   AtomicFlag join_for_testing_returned_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(TaskSchedulerImpl);
 };
 
 }  // namespace internal
 }  // namespace base
 
 #endif  // BASE_TASK_SCHEDULER_TASK_SCHEDULER_IMPL_H_