Finish removing WebKitSystemInterface from Blink.

Source/core/platform/mac/ScrollbarThemeMac.mm

 /*
  * Copyright (C) 2008, 2011 Apple 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 17 matching lines @@
 
 #include <Carbon/Carbon.h>
 #include "core/platform/PlatformMouseEvent.h"
 #include "core/platform/ScrollView.h"
 #include "core/platform/graphics/GraphicsLayer.h"
 #include "core/platform/graphics/ImageBuffer.h"
 #include "core/platform/graphics/mac/ColorMac.h"
 #include "core/platform/mac/LocalCurrentGraphicsContext.h"
 #include "core/platform/mac/NSScrollerImpDetails.h"
 #include "core/platform/mac/ScrollAnimatorMac.h"
-#include "core/platform/mac/WebCoreSystemInterface.h"
 #include <wtf/HashMap.h>
 #include <wtf/StdLibExtras.h>
 #include <wtf/TemporaryChange.h>
 #include <wtf/UnusedParam.h>
 
 // FIXME: There are repainting problems due to Aqua scroll bar buttons' visual overflow.
 
 using namespace std;
 using namespace WebCore;
 
@@ skipping 415 matching lines @@
     }
 }
 
 void ScrollbarThemeMac::updateEnabledState(ScrollbarThemeClient* scrollbar)
 {
     if (isScrollbarOverlayAPIAvailable())
         [scrollbarMap()->get(scrollbar).get() setEnabled:scrollbar->enabled()];
 }
 
 } // namespace WebCore