Remove SchedulerWorkerPoolImpl::ReEnqueueSequenceCallback.

base/task_scheduler/scheduler_worker_pool.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_SCHEDULER_WORKER_POOL_H_
 #define BASE_TASK_SCHEDULER_SCHEDULER_WORKER_POOL_H_
 
 #include <memory>
 
 #include "base/base_export.h"
 #include "base/memory/ref_counted.h"
 #include "base/sequenced_task_runner.h"
 #include "base/task_runner.h"
 #include "base/task_scheduler/sequence.h"
 #include "base/task_scheduler/task.h"
 #include "base/task_scheduler/task_traits.h"
 
 namespace base {
 namespace internal {
 
-class SequenceSortKey;
-
 // Interface for a worker pool.
 class BASE_EXPORT SchedulerWorkerPool {
  public:
   virtual ~SchedulerWorkerPool() = default;
 
   // Returns a TaskRunner whose PostTask invocations result in scheduling tasks
   // in this SchedulerWorkerPool using |traits|. Tasks may run in any order and
   // in parallel.
   virtual scoped_refptr<TaskRunner> CreateTaskRunnerWithTraits(
       const TaskTraits& traits) = 0;
 
   // Returns a SequencedTaskRunner whose PostTask invocations result in
   // scheduling tasks in this SchedulerWorkerPool using |traits|. Tasks run one
   // at a time in posting order.
   virtual scoped_refptr<SequencedTaskRunner>
   CreateSequencedTaskRunnerWithTraits(const TaskTraits& traits) = 0;
 
-  // Inserts |sequence| with |sequence_sort_key| into a queue of Sequences that
-  // can be processed by any worker owned by this SchedulerWorkerPool. Must only
-  // be used to put |sequence| back into a queue after running a Task from it.
-  // The thread that calls this doesn't have to belong to this
-  // SchedulerWorkerPool.
-  virtual void ReEnqueueSequence(scoped_refptr<Sequence> sequence,
-                                 const SequenceSortKey& sequence_sort_key) = 0;
-
   // Posts |task| to be executed by this SchedulerWorkerPool as part of
   // |sequence|. |task| won't be executed before its delayed run time, if any.
   // Returns true if |task| is posted.
   virtual bool PostTaskWithSequence(std::unique_ptr<Task> task,
                                     scoped_refptr<Sequence> sequence) = 0;
 
   // Posts |task| to be executed by this SchedulerWorkerPool as part of
   // |sequence|. This must only be called after |task| has gone through
   // PostTaskWithSequence() and after |task|'s delayed run time.
   virtual void PostTaskWithSequenceNow(std::unique_ptr<Task> task,
                                        scoped_refptr<Sequence> sequence) = 0;
 };
 
 }  // namespace internal
 }  // namespace base
 
 #endif  // BASE_TASK_SCHEDULER_SCHEDULER_WORKER_POOL_H_