Replace Closure in TaskRunner::PostTask with OneShotCallback

base/test/null_task_runner.h

Index: base/test/null_task_runner.h
diff --git a/base/test/null_task_runner.h b/base/test/null_task_runner.h
index f1eac45afd844758f953752632a4184b2f329c71..dd2ef7908e64f3757fa4287a8cec6066b84ace02 100644
--- a/base/test/null_task_runner.h
+++ b/base/test/null_task_runner.h
@@ -19,10 +19,10 @@ class NullTaskRunner : public base::SingleThreadTaskRunner {
   NullTaskRunner();
 
   bool PostDelayedTask(const tracked_objects::Location& from_here,
-                       const base::Closure& task,
+                       base::OnceClosure task,
                        base::TimeDelta delay) override;
   bool PostNonNestableDelayedTask(const tracked_objects::Location& from_here,
-                                  const base::Closure& task,
+                                  base::OnceClosure task,
                                   base::TimeDelta delay) override;
   // Always returns true to avoid triggering DCHECKs.
   bool RunsTasksOnCurrentThread() const override;