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

base/test/thread_test_helper.cc

Index: base/test/thread_test_helper.cc
diff --git a/base/test/thread_test_helper.cc b/base/test/thread_test_helper.cc
index 97b6647a0aad7386c6468832fe92cddb2ee2fb65..38edc9d7f45fe7b8cb14c0582f0887b406196bb5 100644
--- a/base/test/thread_test_helper.cc
+++ b/base/test/thread_test_helper.cc
@@ -21,7 +21,7 @@ ThreadTestHelper::ThreadTestHelper(
 
 bool ThreadTestHelper::Run() {
   if (!target_thread_->PostTask(
-          FROM_HERE, base::Bind(&ThreadTestHelper::RunInThread, this))) {
+          FROM_HERE, base::BindOnce(&ThreadTestHelper::RunInThread, this))) {
     return false;
   }
   base::ThreadRestrictions::ScopedAllowWait allow_wait;