Oilpan: move FetchBodyStream to the heap.

Source/modules/serviceworkers/Response.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 Response_h
 #define Response_h
 
 #include "bindings/core/v8/Dictionary.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "modules/serviceworkers/FetchBodyStream.h"
@@ skipping 20 matching lines @@
     static PassRefPtrWillBeRawPtr<Response> create(Blob*, const ResponseInit&, ExceptionState&);
 
     static PassRefPtrWillBeRawPtr<Response> create(PassRefPtrWillBeRawPtr<FetchResponseData>);
 
     String type() const;
     String url() const;
     unsigned short status() const;
     String statusText() const;
     PassRefPtrWillBeRawPtr<Headers> headers() const;
 
-    PassRefPtr<FetchBodyStream> body(ExecutionContext*);
+    PassRefPtrWillBeRawPtr<FetchBodyStream> body(ExecutionContext*);
 
     void populateWebServiceWorkerResponse(blink::WebServiceWorkerResponse&);
 
     void trace(Visitor*);
 
 private:
     Response();
     explicit Response(PassRefPtrWillBeRawPtr<FetchResponseData>);
 
     RefPtrWillBeMember<FetchResponseData> m_response;
     RefPtrWillBeMember<Headers> m_headers;
-    // FIXME: Make this RefPtrWillBeMember.
-    RefPtr<FetchBodyStream> m_fetchBodyStream;
+    RefPtrWillBeMember<FetchBodyStream> m_fetchBodyStream;
 };
 
 } // namespace WebCore
 
 #endif // Response_h