| Index: base/test/thread_test_helper.cc | 
| diff --git a/base/test/thread_test_helper.cc b/base/test/thread_test_helper.cc | 
| index f238cee43bccccee48a26c2ac4dc2a5de212566c..97b6647a0aad7386c6468832fe92cddb2ee2fb65 100644 | 
| --- a/base/test/thread_test_helper.cc | 
| +++ b/base/test/thread_test_helper.cc | 
| @@ -16,7 +16,8 @@ ThreadTestHelper::ThreadTestHelper( | 
| scoped_refptr<SingleThreadTaskRunner> target_thread) | 
| : test_result_(false), | 
| target_thread_(std::move(target_thread)), | 
| -      done_event_(false, false) {} | 
| +      done_event_(WaitableEvent::ResetPolicy::AUTOMATIC, | 
| +                  WaitableEvent::InitialState::NOT_SIGNALED) {} | 
|  | 
| bool ThreadTestHelper::Run() { | 
| if (!target_thread_->PostTask( | 
|  |