Have ScriptPromiseResolver on the Oilpan heap always.

Source/modules/notifications/ServiceWorkerRegistrationNotifications.cpp

Index: Source/modules/notifications/ServiceWorkerRegistrationNotifications.cpp
diff --git a/Source/modules/notifications/ServiceWorkerRegistrationNotifications.cpp b/Source/modules/notifications/ServiceWorkerRegistrationNotifications.cpp
index ac2bcaec02037e1256b58a055222926dcb0ac25a..f5a96ba92c4c9fba90695f3d77d26906d161923d 100644
--- a/Source/modules/notifications/ServiceWorkerRegistrationNotifications.cpp
+++ b/Source/modules/notifications/ServiceWorkerRegistrationNotifications.cpp
@@ -78,7 +78,7 @@ ScriptPromise ServiceWorkerRegistrationNotifications::showNotification(ScriptSta
             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.
@@ -109,7 +109,7 @@ ScriptPromise ServiceWorkerRegistrationNotifications::showNotification(ScriptSta
 
 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);