Have ScriptPromiseResolver on the Oilpan heap always.

Source/modules/push_messaging/PushPermissionStatusCallbacks.h

 // 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.
 
 #ifndef PushPermissionStatusCallbacks_h
 #define PushPermissionStatusCallbacks_h
 
 #include "platform/heap/Handle.h"
 #include "public/platform/modules/push_messaging/WebPushPermissionStatus.h"
 #include "public/platform/modules/push_messaging/WebPushProvider.h"
 #include "wtf/Noncopyable.h"
-#include "wtf/PassRefPtr.h"
-#include "wtf/RefPtr.h"
 
 namespace WTF {
 class String;
 }
 
 namespace blink {
 
 class ScriptPromiseResolver;
 
 // Will resolve the underlying promise depending on the permission received.
 class PushPermissionStatusCallbacks final : public WebPushPermissionStatusCallbacks {
     WTF_MAKE_NONCOPYABLE(PushPermissionStatusCallbacks);
 
 public:
-    explicit PushPermissionStatusCallbacks(PassRefPtrWillBeRawPtr<ScriptPromiseResolver>);
+    explicit PushPermissionStatusCallbacks(ScriptPromiseResolver*);
     ~PushPermissionStatusCallbacks() override;
 
     void onSuccess(WebPushPermissionStatus*) override;
 
     // Called if for some reason the status of the push permission cannot be checked.
     void onError(WebPushError*) override;
 
 private:
     static WTF::String permissionString(WebPushPermissionStatus);
-    RefPtrWillBePersistent<ScriptPromiseResolver> m_resolver;
+    Persistent<ScriptPromiseResolver> m_resolver;
 };
 
 } // namespace blink
 
 #endif // PushPermissionStatusCallbacks_h