Use OnceClosure in TestPendingTask

base/test/test_simple_task_runner.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/test/test_simple_task_runner.h"
 
 #include "base/logging.h"
 
 namespace base {
 
@@ skipping 60 matching lines @@
 void TestSimpleTaskRunner::RunPendingTasks() {
   DCHECK(RunsTasksOnCurrentThread());
 
   // Swap with a local variable to avoid re-entrancy problems.
   std::deque<TestPendingTask> tasks_to_run;
   {
     AutoLock auto_lock(lock_);
     tasks_to_run.swap(pending_tasks_);
   }
 
-  for (const auto& task : tasks_to_run)
-    task.task.Run();
+  for (auto& task : tasks_to_run)
+    std::move(task.task).Run();
 }
 
 void TestSimpleTaskRunner::RunUntilIdle() {
   while (!pending_tasks_.empty()) {
     RunPendingTasks();
   }
 }
 
 }  // namespace base