Update from https://crrev.com/306655

base/synchronization/waitable_event_win.cc

Index: base/synchronization/waitable_event_win.cc
diff --git a/base/synchronization/waitable_event_win.cc b/base/synchronization/waitable_event_win.cc
index ec2d84f2679ad840cb460f1247fee5825f269a19..770c582aedeaf1975ec166efcf1fc94a9b8355ea 100644
--- a/base/synchronization/waitable_event_win.cc
+++ b/base/synchronization/waitable_event_win.cc
@@ -20,18 +20,14 @@ WaitableEvent::WaitableEvent(bool manual_reset, bool signaled)
   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());
 }