Replace base::Callback with base::OnceCallback in base::PendingTask

base/threading/worker_pool_posix.cc

 // Copyright (c) 2012 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/threading/worker_pool_posix.h"
 
 #include <stddef.h>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 72 matching lines @@
   PlatformThread::SetName(name);
 
   for (;;) {
     PendingTask pending_task = pool_->WaitForTask();
     if (pending_task.task.is_null())
       break;
     TRACE_TASK_EXECUTION("WorkerThread::ThreadMain::Run", pending_task);
 
     tracked_objects::TaskStopwatch stopwatch;
     stopwatch.Start();
-    pending_task.task.Run();
+    std::move(pending_task.task).Run();
     stopwatch.Stop();
 
     tracked_objects::ThreadData::TallyRunOnWorkerThreadIfTracking(
         pending_task.birth_tally, pending_task.time_posted, stopwatch);
   }
 
   // The WorkerThread is non-joinable, so it deletes itself.
   delete this;
 }
 
@@ skipping 80 matching lines @@
       return PendingTask(FROM_HERE, base::Closure());
     }
   }
 
   PendingTask pending_task = std::move(pending_tasks_.front());
   pending_tasks_.pop();
   return pending_task;
 }
 
 }  // namespace base