More WaitableEvent stragglers migrated to enum-based constructor

ui/ozone/platform/drm/gpu/proxy_helpers.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/ozone/platform/drm/gpu/proxy_helpers.h"
 
 #include "base/synchronization/waitable_event.h"
 
 namespace ui {
 
 namespace {
 
 void OnRunPostedTaskAndSignal(const base::Closure& callback,
                               base::WaitableEvent* wait) {
   callback.Run();
   wait->Signal();
 }
 
 }  // namespace
 
 void PostSyncTask(
     const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
     const base::Closure& callback) {
-  base::WaitableEvent wait(false, false);
+  base::WaitableEvent wait(base::WaitableEvent::ResetPolicy::AUTOMATIC,
+                           base::WaitableEvent::InitialState::NOT_SIGNALED);
   bool success = task_runner->PostTask(
       FROM_HERE, base::Bind(OnRunPostedTaskAndSignal, callback, &wait));
   if (success)
     wait.Wait();
 }
 
 }  // namespace ui