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

base/task_scheduler/test_task_factory.cc

Index: base/task_scheduler/test_task_factory.cc
diff --git a/base/task_scheduler/test_task_factory.cc b/base/task_scheduler/test_task_factory.cc
index 3b4e7235f0128fdcf84f00508736cebbb3336b8f..8db2042e05c94dd813ad4a3ed2b7bfc00a4299a4 100644
--- a/base/task_scheduler/test_task_factory.cc
+++ b/base/task_scheduler/test_task_factory.cc
@@ -37,8 +37,8 @@ bool TestTaskFactory::PostTask(PostNestedTask post_nested_task,
   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 {