Have ScriptPromiseResolver on the Oilpan heap always.

Source/modules/presentation/PresentationSessionClientCallbacks.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 "config.h"
 #include "modules/presentation/PresentationSessionClientCallbacks.h"
 
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/ExceptionCode.h"
 #include "modules/presentation/Presentation.h"
 #include "modules/presentation/PresentationError.h"
 #include "modules/presentation/PresentationSession.h"
 #include "public/platform/WebString.h"
 #include "public/platform/modules/presentation/WebPresentationError.h"
 #include "wtf/OwnPtr.h"
 
 namespace blink {
 
 PresentationSessionClientCallbacks::PresentationSessionClientCallbacks(
-    PassRefPtrWillBeRawPtr<ScriptPromiseResolver> resolver,
+    ScriptPromiseResolver* resolver,
     Presentation* presentation)
     : m_resolver(resolver)
     , m_presentation(presentation)
 {
     ASSERT(m_resolver);
     ASSERT(m_presentation);
 }
 
 PresentationSessionClientCallbacks::~PresentationSessionClientCallbacks()
 {
@@ skipping 11 matching lines @@
 void PresentationSessionClientCallbacks::onError(WebPresentationError* result)
 {
     OwnPtr<WebPresentationError> error = adoptPtr(result);
     if (!m_resolver->executionContext() || m_resolver->executionContext()->activeDOMObjectsAreStopped())
         return;
 
     m_resolver->reject(PresentationError::take(*error));
 }
 
 } // namespace blink