Clean up forward declarations in Source/core/loader

Source/core/loader/DocumentLoadTiming.h

 /*
  * Copyright (C) 2010 Google, 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 12 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef DocumentLoadTiming_h
 #define DocumentLoadTiming_h
 
 #include "wtf/CurrentTime.h"
 
 namespace blink {
 
-class LocalFrame;
 class KURL;
 
 class DocumentLoadTiming {
 public:
     DocumentLoadTiming();
 
     double monotonicTimeToZeroBasedDocumentTime(double) const;
     double monotonicTimeToPseudoWallTime(double) const;
 
     void markNavigationStart();
@@ skipping 37 matching lines @@
     double m_responseEnd;
     double m_loadEventStart;
     double m_loadEventEnd;
     bool m_hasCrossOriginRedirect;
     bool m_hasSameOriginAsPreviousDocument;
 };
 
 } // namespace blink
 
 #endif