Fix ResourceLoadTiming Resolution Issue 3rd step - remove old fields

Source/core/page/PerformanceResourceTiming.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 54 matching lines @@
     double requestStart() const;
     double responseStart() const;
     double responseEnd() const;
 
     virtual bool isResource() { return true; }
 
 private:
     PerformanceResourceTiming(const AtomicString& initatorType, const ResourceRequest&, const ResourceResponse&, double initiationTime, double finishTime, Document*);
     ~PerformanceResourceTiming();
 
-#ifndef ENABLE_DOUBLE_RESOURCE_LOAD_TIMING
-    double resourceTimeToDocumentMilliseconds(int deltaMilliseconds) const;
-#endif
-
     AtomicString m_initiatorType;
     RefPtr<ResourceLoadTiming> m_timing;
     double m_finishTime;
     bool m_didReuseConnection;
     bool m_shouldReportDetails;
     RefPtr<Document> m_requestingDocument;
 };
 
 }
 
 #endif // !defined(PerformanceResourceTiming_h)