ServiceWorker: Spec alignment tweaks for Request/Response objects

Source/modules/serviceworkers/RequestInit.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 RequestInit_h
 #define RequestInit_h
 
 #include "bindings/v8/Dictionary.h"
 #include "modules/serviceworkers/HeaderMap.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
 
 struct RequestInit {
     explicit RequestInit(const Dictionary& options)
         : method("GET")
     {
         options.get("url", url);
+        // FIXME: Spec uses ByteString for method. http://crbug.com/347426
         options.get("method", method);
         options.get("headers", headers);
     }
 
     String url;
     String method;
     RefPtr<HeaderMap> headers;
 };
 
 }
 
 #endif // RequestInit_h