Remove unused includes from various .cpp files in core/

Source/core/loader/DocumentLoadTiming.cpp

 /*
  * Copyright (C) 2011 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 10 matching lines @@
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/loader/DocumentLoadTiming.h"
 
 #include <wtf/CurrentTime.h>
 #include <wtf/RefPtr.h>
-#include "core/dom/Document.h"
-#include "core/loader/DocumentLoader.h"
-#include "core/page/Frame.h"
-#include "core/page/Page.h"
 #include "weborigin/SecurityOrigin.h"
 
 namespace WebCore {
 
 DocumentLoadTiming::DocumentLoadTiming()
     : m_referenceMonotonicTime(0.0)
     , m_referenceWallTime(0.0)
     , m_navigationStart(0.0)
     , m_unloadEventStart(0.0)
     , m_unloadEventEnd(0.0)
@@ skipping 42 matching lines @@
     m_redirectCount++;
     if (!m_redirectStart)
         m_redirectStart = m_fetchStart;
     m_redirectEnd = m_fetchStart = monotonicallyIncreasingTime();
     // Check if the redirected url is allowed to access the redirecting url's timing information.
     RefPtr<SecurityOrigin> redirectedSecurityOrigin = SecurityOrigin::create(redirectedUrl);
     m_hasCrossOriginRedirect = !redirectedSecurityOrigin->canRequest(redirectingUrl);
 }
 
 } // namespace WebCore