[ServiceWorker] Make fetch() method better conformance with the spec.

Source/modules/serviceworkers/Request.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 Request_h
 #define Request_h
 
 #include "bindings/core/v8/Dictionary.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "modules/serviceworkers/FetchRequestData.h"
@@ skipping 28 matching lines @@
     PassRefPtrWillBeRawPtr<FetchRequestData> request() { return m_request; }
 
     String method() const;
     String url() const;
     PassRefPtrWillBeRawPtr<Headers> headers() const { return m_headers; }
     // FIXME: Support body.
     String referrer() const;
     String mode() const;
     String credentials() const;
 
-    PassOwnPtr<ResourceRequest> createResourceRequest() const;
-
     void trace(Visitor*);
 
 private:
     explicit Request(PassRefPtrWillBeRawPtr<FetchRequestData>);
     explicit Request(const blink::WebServiceWorkerRequest&);
 
     RefPtrWillBeMember<FetchRequestData> m_request;
     RefPtrWillBeMember<Headers> m_headers;
 };
 
 } // namespace blink
 
 #endif // Request_h