Migrate base::TaskRunner from Closure to OnceClosure

base/task_scheduler/task.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_H_
 #define BASE_TASK_SCHEDULER_TASK_H_
 
 #include "base/base_export.h"
 #include "base/callback.h"
 #include "base/location.h"
@@ skipping 10 matching lines @@
 
 // A task is a unit of work inside the task scheduler. Support for tracing and
 // profiling inherited from PendingTask.
 struct BASE_EXPORT Task : public PendingTask {
   // |posted_from| is the site the task was posted from. |task| is the closure
   // to run. |traits_in| is metadata about the task. |delay| is a delay that
   // must expire before the Task runs. If |delay| is non-zero and the shutdown
   // behavior in |traits| is BLOCK_SHUTDOWN, the shutdown behavior is
   // automatically adjusted to SKIP_ON_SHUTDOWN.
   Task(const tracked_objects::Location& posted_from,
-       Closure task,
+       OnceClosure task,
        const TaskTraits& traits,
        TimeDelta delay);
   ~Task();
 
   // The TaskTraits of this task.
   const TaskTraits traits;
 
   // The delay that must expire before the task runs.
   const TimeDelta delay;
 
@@ skipping 18 matching lines @@
  private:
   // Disallow copies to make sure no unnecessary ref-bumps are incurred. Making
   // it move-only would be an option, but isn't necessary for now.
   DISALLOW_COPY_AND_ASSIGN(Task);
 };
 
 }  // namespace internal
 }  // namespace base
 
 #endif  // BASE_TASK_SCHEDULER_TASK_H_