Replace Closure in TaskRunner::PostTask with OneShotCallback

base/task_scheduler/task_tracker.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_TRACKER_H_
 #define BASE_TASK_SCHEDULER_TASK_TRACKER_H_
 
 #include <memory>
 
 #include "base/base_export.h"
@@ skipping 30 matching lines @@
   void Shutdown();
 
   // Informs this TaskTracker that |task| is about to be posted. Returns true if
   // this operation is allowed (|task| should be posted if-and-only-if it is).
   bool WillPostTask(const Task* task);
 
   // Runs |task| unless the current shutdown state prevents that.
   // |sequence_token| is the token identifying the sequence from which |task|
   // was extracted. Returns true if |task| ran. WillPostTask() must have allowed
   // |task| to be posted before this is called.
-  bool RunTask(const Task* task, const SequenceToken& sequence_token);
+  bool RunTask(Task* task, const SequenceToken& sequence_token);
 
   // Returns true once shutdown has started (Shutdown() has been called but
   // might not have returned). Note: sequential consistency with the thread
   // calling Shutdown() (or SetHasShutdownStartedForTesting()) isn't guaranteed
   // by this call.
   bool HasShutdownStarted() const;
 
   // Returns true if shutdown has completed (Shutdown() has returned).
   bool IsShutdownComplete() const;
 
@@ skipping 38 matching lines @@
   // Number of BLOCK_SHUTDOWN tasks posted during shutdown.
   HistogramBase::Sample num_block_shutdown_tasks_posted_during_shutdown_ = 0;
 
   DISALLOW_COPY_AND_ASSIGN(TaskTracker);
 };
 
 }  // namespace internal
 }  // namespace base
 
 #endif  // BASE_TASK_SCHEDULER_TASK_TRACKER_H_