Update from https://crrev.com/306655

base/synchronization/waitable_event_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.h"
 
 #include <math.h>
 #include <windows.h>
 
 #include "base/logging.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/time/time.h"
 
 namespace base {
 
 WaitableEvent::WaitableEvent(bool manual_reset, bool signaled)
     : handle_(CreateEvent(NULL, manual_reset, signaled, NULL)) {
   // We're probably going to crash anyways if this is ever NULL, so we might as
   // well make our stack reports more informative by crashing here.
   CHECK(handle_.IsValid());
 }
 
-WaitableEvent::WaitableEvent(HANDLE handle)
-    : handle_(handle) {
+WaitableEvent::WaitableEvent(win::ScopedHandle handle)
+    : handle_(handle.Pass()) {
   CHECK(handle_.IsValid()) << "Tried to create WaitableEvent from NULL handle";
 }
 
 WaitableEvent::~WaitableEvent() {
 }
 
-HANDLE WaitableEvent::Release() {
-  return handle_.Take();
-}
-
 void WaitableEvent::Reset() {
   ResetEvent(handle_.Get());
 }
 
 void WaitableEvent::Signal() {
   SetEvent(handle_.Get());
 }
 
 bool WaitableEvent::IsSignaled() {
   return TimedWait(TimeDelta::FromMilliseconds(0));
@@ skipping 46 matching lines @@
                              INFINITE);  // no timeout
   if (result >= WAIT_OBJECT_0 + count) {
     DPLOG(FATAL) << "WaitForMultipleObjects failed";
     return 0;
   }
 
   return result - WAIT_OBJECT_0;
 }
 
 }  // namespace base