Clean up forward declarations in Source/core

Source/core/timing/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 22 matching lines @@
 #define PerformanceResourceTiming_h
 
 #include "core/timing/PerformanceEntry.h"
 #include "platform/heap/Handle.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 class Document;
-class KURL;
 class ResourceLoadTiming;
-class ResourceRequest;
-class ResourceResponse;
 class ResourceTimingInfo;
 
 class PerformanceResourceTiming final : public PerformanceEntry {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<PerformanceResourceTiming> create(const ResourceTimingInfo& info, Document* requestingDocument, double startTime, double lastRedirectEndTime, bool m_allowTimingDetails, bool m_allowRedirectDetails)
     {
         return adoptRefWillBeNoop(new PerformanceResourceTiming(info, requestingDocument, startTime, lastRedirectEndTime, m_allowTimingDetails, m_allowRedirectDetails));
     }
 
@@ skipping 30 matching lines @@
     double m_finishTime;
     bool m_didReuseConnection;
     bool m_allowTimingDetails;
     bool m_allowRedirectDetails;
     RefPtrWillBeMember<Document> m_requestingDocument;
 };
 
 } // namespace blink
 
 #endif // PerformanceResourceTiming_h