Update from https://crrev.com/306655

base/synchronization/waitable_event.h

 // Copyright (c) 2012 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 BASE_SYNCHRONIZATION_WAITABLE_EVENT_H_
 #define BASE_SYNCHRONIZATION_WAITABLE_EVENT_H_
 
 #include "base/base_export.h"
 #include "base/basictypes.h"
 
@@ skipping 35 matching lines @@
   // If manual_reset is true, then to set the event state to non-signaled, a
   // consumer must call the Reset method.  If this parameter is false, then the
   // system automatically resets the event state to non-signaled after a single
   // waiting thread has been released.
   WaitableEvent(bool manual_reset, bool initially_signaled);
 
 #if defined(OS_WIN)
   // Create a WaitableEvent from an Event HANDLE which has already been
   // created. This objects takes ownership of the HANDLE and will close it when
   // deleted.
-  // TODO(rvargas): Pass ScopedHandle instead (and on Release).
-  explicit WaitableEvent(HANDLE event_handle);
-
-  // Releases ownership of the handle from this object.
-  HANDLE Release();
+  explicit WaitableEvent(win::ScopedHandle event_handle);
 #endif
 
   ~WaitableEvent();
 
   // Put the event in the un-signaled state.
   void Reset();
 
   // Put the event in the signaled state.  Causing any thread blocked on Wait
   // to be woken up.
   void Signal();
@@ skipping 113 matching lines @@
 
   scoped_refptr<WaitableEventKernel> kernel_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(WaitableEvent);
 };
 
 }  // namespace base
 
 #endif  // BASE_SYNCHRONIZATION_WAITABLE_EVENT_H_