[wrapper-tracing] Fix dispatching of TraceWrapperv8Reference

third_party/WebKit/Source/core/events/PromiseRejectionEvent.cpp

 // Copyright 2015 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 "core/events/PromiseRejectionEvent.h"
 
 #include "bindings/core/v8/DOMWrapperWorld.h"
 
 namespace blink {
 
 PromiseRejectionEvent::PromiseRejectionEvent(
     ScriptState* state,
     const AtomicString& type,
     const PromiseRejectionEventInit& initializer)
     : Event(type, initializer),
       m_scriptState(state),
       m_promise(this),
       m_reason(this) {
   ThreadState::current()->registerPreFinalizer(this);
   DCHECK(initializer.hasPromise());
   m_promise.set(initializer.promise().isolate(),
                 initializer.promise().v8Value());
-  m_promise.setPhantom();
   if (initializer.hasReason()) {
     m_reason.set(initializer.reason().isolate(),
                  initializer.reason().v8Value());
-    m_reason.setPhantom();
   }
 }
 
 PromiseRejectionEvent::~PromiseRejectionEvent() {}
 
 void PromiseRejectionEvent::dispose() {
   // Clear ScopedPersistents so that V8 doesn't call phantom callbacks
   // (and touch the ScopedPersistents) after Oilpan starts lazy sweeping.
   m_promise.clear();
   m_reason.clear();
@@ skipping 47 matching lines @@
 DEFINE_TRACE(PromiseRejectionEvent) {
   Event::trace(visitor);
 }
 
 DEFINE_TRACE_WRAPPERS(PromiseRejectionEvent) {
   visitor->traceWrappers(m_promise);
   visitor->traceWrappers(m_reason);
 }
 
 }  // namespace blink