Replace Closure in TaskRunner::PostTask with OneShotCallback

base/task_scheduler/task.cc

 // 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.
 
 #include "base/task_scheduler/task.h"
 
 namespace base {
 namespace internal {
 
 Task::Task(const tracked_objects::Location& posted_from,
-           const Closure& task,
+           OnceClosure task,
            const TaskTraits& traits,
            const TimeDelta& delay)
     : PendingTask(posted_from,
-                  task,
+                  std::move(task),
                   delay.is_zero() ? TimeTicks() : TimeTicks::Now() + delay,
                   false),  // Not nestable.
       traits(traits) {}
 
 Task::~Task() = default;
 
 }  // namespace internal
 }  // namespace base