Migrate WaitableEvent to enum-based constructor in media/

media/audio/scoped_task_runner_observer.cc

Index: media/audio/scoped_task_runner_observer.cc
diff --git a/media/audio/scoped_task_runner_observer.cc b/media/audio/scoped_task_runner_observer.cc
index 9f4eac285111787071191ee23fca789c1e46769a..2f43655de1025089f9999281fbc4f258b9609043 100644
--- a/media/audio/scoped_task_runner_observer.cc
+++ b/media/audio/scoped_task_runner_observer.cc
@@ -31,7 +31,8 @@ void ScopedTaskRunnerObserver::ObserveLoopDestruction(
       loop->RemoveDestructionObserver(this);
     }
   } else {
-    base::WaitableEvent event(false, false);
+    base::WaitableEvent event(base::WaitableEvent::ResetPolicy::AUTOMATIC,
+                              base::WaitableEvent::InitialState::NOT_SIGNALED);
     if (task_runner_->PostTask(FROM_HERE,
             base::Bind(&ScopedTaskRunnerObserver::ObserveLoopDestruction,
                        base::Unretained(this), enable, &event))) {