Have ScriptPromiseResolver on the Oilpan heap always.

Source/modules/notifications/ServiceWorkerRegistrationNotifications.cpp

 // Copyright 2014 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/notifications/ServiceWorkerRegistrationNotifications.h"
 
 #include "bindings/core/v8/CallbackPromiseAdapter.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
@@ skipping 60 matching lines @@
             return exceptionState.reject(scriptState);
 
         data->toWireBytes(dataAsWireBytes);
     }
 
     for (const NotificationAction& action : options.actions()) {
         if (action.title().isEmpty())
             return ScriptPromise::reject(scriptState, V8ThrowException::createTypeError(scriptState->isolate(), "Notification action titles must not be empty."));
     }
 
-    RefPtrWillBeRawPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(scriptState);
+    ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
     ScriptPromise promise = resolver->promise();
 
     // FIXME: Do the appropriate CORS checks on the icon URL.
 
     KURL iconUrl;
     if (options.hasIcon() && !options.icon().isEmpty()) {
         iconUrl = executionContext->completeURL(options.icon());
         if (!iconUrl.isValid())
             iconUrl = KURL();
     }
@@ skipping 10 matching lines @@
 
     WebNotificationManager* notificationManager = Platform::current()->notificationManager();
     ASSERT(notificationManager);
 
     notificationManager->showPersistent(WebSecurityOrigin(origin), notification, serviceWorkerRegistration.webRegistration(), callbacks);
     return promise;
 }
 
 ScriptPromise ServiceWorkerRegistrationNotifications::getNotifications(ScriptState* scriptState, ServiceWorkerRegistration& serviceWorkerRegistration, const GetNotificationOptions& options)
 {
-    RefPtrWillBeRawPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(scriptState);
+    ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
     ScriptPromise promise = resolver->promise();
 
     WebNotificationGetCallbacks* callbacks = new CallbackPromiseAdapter<NotificationArray, void>(resolver);
 
     WebNotificationManager* notificationManager = Platform::current()->notificationManager();
     ASSERT(notificationManager);
 
     notificationManager->getNotifications(options.tag(), serviceWorkerRegistration.webRegistration(), callbacks);
     return promise;
 }
 
 } // namespace blink