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

base/threading/post_task_and_reply_impl_unittest.cc

Index: base/threading/post_task_and_reply_impl_unittest.cc
diff --git a/base/threading/post_task_and_reply_impl_unittest.cc b/base/threading/post_task_and_reply_impl_unittest.cc
index f1b1d7afa2e3a706c3b3ff94e17682dbebe30837..664c191b5e4544889b57b9034ffd958c77450289 100644
--- a/base/threading/post_task_and_reply_impl_unittest.cc
+++ b/base/threading/post_task_and_reply_impl_unittest.cc
@@ -78,9 +78,9 @@ TEST(PostTaskAndReplyImplTest, PostTaskAndReply) {
       PostTaskAndReplyTaskRunner(post_runner.get())
           .PostTaskAndReply(
               FROM_HERE,
-              Bind(&MockObject::Task, Unretained(&mock_object),
-                   make_scoped_refptr(new ObjectToDelete(&delete_flag))),
-              Bind(&MockObject::Reply, Unretained(&mock_object))));
+              BindOnce(&MockObject::Task, Unretained(&mock_object),
+                       make_scoped_refptr(new ObjectToDelete(&delete_flag))),
+              BindOnce(&MockObject::Reply, Unretained(&mock_object))));
 
   // Expect the task to be posted to |post_runner|.
   EXPECT_TRUE(post_runner->HasPendingTask());