Rewrite base::Bind into base::BindOnce on trivial cases in base

base/task_scheduler/test_task_factory.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/test_task_factory.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/location.h"
@@ skipping 19 matching lines @@
 
 TestTaskFactory::~TestTaskFactory() {
   WaitForAllTasksToRun();
 }
 
 bool TestTaskFactory::PostTask(PostNestedTask post_nested_task,
                                const Closure& after_task_closure) {
   AutoLock auto_lock(lock_);
   return task_runner_->PostTask(
       FROM_HERE,
-      Bind(&TestTaskFactory::RunTaskCallback, Unretained(this),
-           num_posted_tasks_++, post_nested_task, after_task_closure));
+      BindOnce(&TestTaskFactory::RunTaskCallback, Unretained(this),
+               num_posted_tasks_++, post_nested_task, after_task_closure));
 }
 
 void TestTaskFactory::WaitForAllTasksToRun() const {
   AutoLock auto_lock(lock_);
   while (ran_tasks_.size() < num_posted_tasks_)
     cv_.Wait();
 }
 
 void TestTaskFactory::RunTaskCallback(size_t task_index,
                                       PostNestedTask post_nested_task,
@@ skipping 45 matching lines @@
     cv_.Signal();
   }
 
   if (!after_task_closure.is_null())
     after_task_closure.Run();
 }
 
 }  // namespace test
 }  // namespace internal
 }  // namespace base