Make WaitableEventWatcher TaskScheduler-friendly.

base/synchronization/waitable_event_watcher_win.cc

 // Copyright (c) 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.
 
 #include "base/synchronization/waitable_event_watcher.h"
 
 #include "base/compiler_specific.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/win/object_watcher.h"
 
 namespace base {
 
-WaitableEventWatcher::WaitableEventWatcher()
-    : event_(NULL) {
-}
+WaitableEventWatcher::WaitableEventWatcher() = default;
 
 WaitableEventWatcher::~WaitableEventWatcher() {
 }
 
 bool WaitableEventWatcher::StartWatching(
     WaitableEvent* event,
     const EventCallback& callback) {
   callback_ = callback;
   event_ = event;
   return watcher_.StartWatchingOnce(event->handle(), this);
 }
 
 void WaitableEventWatcher::StopWatching() {
   callback_.Reset();
   event_ = NULL;
   watcher_.StopWatching();
 }
 
-WaitableEvent* WaitableEventWatcher::GetWatchedEvent() {
-  return event_;
-}
-
 void WaitableEventWatcher::OnObjectSignaled(HANDLE h) {
   WaitableEvent* event = event_;
   EventCallback callback = callback_;
   event_ = NULL;
   callback_.Reset();
   DCHECK(event);
 
   callback.Run(event);
 }
 
 }  // namespace base