Patch on top of https://codereview.chromium.org/433793002/

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 21 matching lines @@
     static Response* create(const WebServiceWorkerResponse&);
 
     String type() const;
     String url() const;
     unsigned short status() const;
     String statusText() const;
     Headers* headers() const;
 
     FetchBodyStream* body(ExecutionContext*);
 
-    void populateWebServiceWorkerResponse(WebServiceWorkerResponse&);
+    void populateWebServiceWorkerResponse(WebServiceWorkerResponse&) const;
 
     void trace(Visitor*);
 
 private:
     Response();
     explicit Response(FetchResponseData*);
     explicit Response(const WebServiceWorkerResponse&);
 
     Member<FetchResponseData> m_response;
     Member<Headers> m_headers;
     Member<FetchBodyStream> m_fetchBodyStream;
 };
 
 } // namespace blink
 
 #endif // Response_h