Remove a bunch of OS(MACOSX) code

sky/engine/platform/scroll/Scrollbar.cpp

 /*
  * Copyright (C) 2004, 2006, 2008 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 20 matching lines @@
 #include "platform/PlatformMouseEvent.h"
 #include "platform/scroll/ScrollableArea.h"
 #include "platform/scroll/ScrollAnimator.h"
 #include "platform/scroll/Scrollbar.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebPoint.h"
 #include "public/platform/WebRect.h"
 #include "public/platform/WebScrollbarBehavior.h"
 #include "public/platform/WebThemeEngine.h"
 
-#if ((OS(POSIX) && !OS(MACOSX)) || OS(WIN))
 // The position of the scrollbar thumb affects the appearance of the steppers, so
 // when the thumb moves, we have to invalidate them for painting.
 #define THUMB_POSITION_AFFECTS_BUTTONS
-#endif
 
 namespace blink {
 
 static const int kThumbThickness = 3;
 static const int kScrollbarMargin = 3;
 
 PassRefPtr<Scrollbar> Scrollbar::create(ScrollableArea* scrollableArea, ScrollbarOrientation orientation)
 {
     return adoptRef(new Scrollbar(scrollableArea, orientation));
 }
@@ skipping 561 matching lines @@
         thumbRect.setWidth(thumbRect.width() - kScrollbarMargin);
         if (isLeftSideVerticalScrollbar())
             thumbRect.setX(thumbRect.x() + kScrollbarMargin);
     }
 
     DEFINE_STATIC_LOCAL(Color, color, (128, 128, 128, 128));
     context->fillRect(thumbRect, color);
 }
 
 } // namespace blink