Remove unused includes from various .cpp files in core/

Source/core/page/Performance.cpp

 /*
  * Copyright (C) 2010 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 @@
 #include "core/page/Performance.h"
 
 #include "core/dom/Document.h"
 #include "core/loader/DocumentLoader.h"
 #include "core/page/MemoryInfo.h"
 #include "core/page/PerformanceEntry.h"
 #include "core/page/PerformanceNavigation.h"
 #include "core/page/PerformanceResourceTiming.h"
 #include "core/page/PerformanceTiming.h"
 #include "core/page/PerformanceUserTiming.h"
-#include "core/platform/network/ResourceResponse.h"
 #include <wtf/CurrentTime.h>
 
 #include "core/page/Frame.h"
 
 namespace WebCore {
 
 static const size_t defaultResourceTimingBufferSize = 150;
 
 Performance::Performance(Frame* frame)
     : DOMWindowProperty(frame)
@@ skipping 163 matching lines @@
         m_userTiming = UserTiming::create(this);
     m_userTiming->clearMeasures(measureName);
 }
 
 double Performance::now() const
 {
     return 1000.0 * m_frame->document()->loader()->timing()->monotonicTimeToZeroBasedDocumentTime(monotonicallyIncreasingTime());
 }
 
 } // namespace WebCore