Have ScriptPromiseResolver on the Oilpan heap always.

Source/modules/vr/NavigatorVRDevice.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/vr/NavigatorVRDevice.h"
 
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/Document.h"
@@ skipping 30 matching lines @@
     return *supplement;
 }
 
 ScriptPromise NavigatorVRDevice::getVRDevices(ScriptState* scriptState, Navigator& navigator)
 {
     return NavigatorVRDevice::from(navigator).getVRDevices(scriptState);
 }
 
 ScriptPromise NavigatorVRDevice::getVRDevices(ScriptState* scriptState)
 {
-    RefPtrWillBeRawPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(scriptState);
+    ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
     ScriptPromise promise = resolver->promise();
 
     Document* document = m_frame ? m_frame->document() : 0;
 
     if (!document || !controller()) {
         DOMException* exception = DOMException::create(InvalidStateError, "The object is no longer associated to a document.");
         resolver->reject(exception);
         return promise;
     }
 
@@ skipping 27 matching lines @@
 NavigatorVRDevice::~NavigatorVRDevice()
 {
 }
 
 const char* NavigatorVRDevice::supplementName()
 {
     return "NavigatorVRDevice";
 }
 
 } // namespace blink