Update Background Fetch IDLs following spec changes

third_party/WebKit/Source/modules/background_fetch/BackgroundFetchSettledRequest.h

-// Copyright 2017 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 BackgroundFetchSettledRequest_h
-#define BackgroundFetchSettledRequest_h
-
-#include "modules/background_fetch/BackgroundFetchRequest.h"
-#include "platform/heap/Handle.h"
-
-namespace blink {
-
-class Request;
-class Response;
-
-// Interface for providing developers access to the Request/Response pairs when
-// a background fetch has settled, either through the `backgroundfetched` event
-// in case of success, or `backgroundfetchfail` in case of failure.
-class BackgroundFetchSettledRequest final : public BackgroundFetchRequest {
-  DEFINE_WRAPPERTYPEINFO();
-
- public:
-  static BackgroundFetchSettledRequest* create(Request* request,
-                                               Response* response) {
-    return new BackgroundFetchSettledRequest(request, response);
-  }
-
-  // Web Exposed attribute defined in the IDL file.
-  Response* response() const;
-
-  DECLARE_VIRTUAL_TRACE();
-
- private:
-  BackgroundFetchSettledRequest(Request*, Response*);
-
-  Member<Response> m_response;
-};
-
-}  // namespace blink
-
-#endif  // BackgroundFetchSettledRequest_h