Migrate WaitableEvent to enum-based constructor in completion_event.h

cc/base/completion_event.h

 // Copyright 2011 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.
 
 #ifndef CC_BASE_COMPLETION_EVENT_H_
 #define CC_BASE_COMPLETION_EVENT_H_
 
 #include "base/logging.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/time/time.h"
 
 namespace cc {
 
 // Used for making blocking calls from one thread to another. Use only when
 // absolutely certain that doing-so will not lead to a deadlock.
 //
 // It is safe to destroy this object as soon as Wait() returns.
 class CompletionEvent {
  public:
   CompletionEvent()
-      : event_(false /* manual_reset */, false /* initially_signaled */) {
+      : event_(base::WaitableEvent::ResetPolicy::AUTOMATIC,
+               base::WaitableEvent::InitialState::NOT_SIGNALED) {
 #if DCHECK_IS_ON()
     waited_ = false;
     signaled_ = false;
 #endif
   }
 
   ~CompletionEvent() {
 #if DCHECK_IS_ON()
     DCHECK(waited_);
     DCHECK(signaled_);
@@ skipping 32 matching lines @@
 #if DCHECK_IS_ON()
   // Used to assert that Wait() and Signal() are each called exactly once.
   bool waited_;
   bool signaled_;
 #endif
 };
 
 }  // namespace cc
 
 #endif  // CC_BASE_COMPLETION_EVENT_H_