mac: Remove IsOSSnowLeopard().

third_party/WebKit/Source/platform/scroll/Scrollbar.h

 /*
  * Copyright (C) 2004, 2006 Apple Computer, 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 98 matching lines @@
     virtual void setPressedPart(ScrollbarPart);
 
     void setProportion(int visibleSize, int totalSize);
     void setPressedPos(int p) { m_pressedPos = p; }
 
     void paint(GraphicsContext&, const CullRect&) const final;
 
     bool isOverlayScrollbar() const override;
     bool shouldParticipateInHitTesting();
 
-    void windowActiveChangedForSnowLeopardOnly();
     bool isWindowActive() const;
 
     // Return if the gesture event was handled. |shouldUpdateCapture|
     // will be set to true if the handler should update the capture
     // state for this scrollbar.
     bool gestureEvent(const PlatformGestureEvent&, bool* shouldUpdateCapture);
 
     // These methods are used for platform scrollbars to give :hover feedback.  They will not get called
     // when the mouse went down in a scrollbar, since it is assumed the scrollbar will start
     // grabbing all events in that case anyway.
@@ skipping 99 matching lines @@
 
     bool m_trackNeedsRepaint;
     bool m_thumbNeedsRepaint;
 };
 
 DEFINE_TYPE_CASTS(Scrollbar, Widget, widget, widget->isScrollbar(), widget.isScrollbar());
 
 } // namespace blink
 
 #endif // Scrollbar_h