Rename OS(DARWIN) to OS(MACOSX).

Source/core/platform/ScrollAnimator.cpp

 /*
  * Copyright (c) 2010, 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 68 matching lines @@
     bool canScrollX = m_scrollableArea->userInputScrollable(HorizontalScrollbar);
     bool canScrollY = m_scrollableArea->userInputScrollable(VerticalScrollbar);
 
     // Accept the event if we are scrollable in that direction and can still
     // scroll any further.
     float deltaX = canScrollX ? e.deltaX() : 0;
     float deltaY = canScrollY ? e.deltaY() : 0;
 
     bool handled = false;
 
-#if !OS(DARWIN)
+#if !OS(MACOSX)
     ScrollGranularity granularity = e.hasPreciseScrollingDeltas() ? ScrollByPrecisePixel : ScrollByPixel;
 #else
     ScrollGranularity granularity = ScrollByPixel;
 #endif
 
     IntSize maxForwardScrollDelta = m_scrollableArea->maximumScrollPosition() - m_scrollableArea->scrollPosition();
     IntSize maxBackwardScrollDelta = m_scrollableArea->scrollPosition() - m_scrollableArea->minimumScrollPosition();
     if ((deltaX < 0 && maxForwardScrollDelta.width() > 0)
         || (deltaX > 0 && maxBackwardScrollDelta.width() > 0)
         || (deltaY < 0 && maxForwardScrollDelta.height() > 0)
@@ skipping 43 matching lines @@
 }
 
 float ScrollAnimator::clampScrollPosition(ScrollbarOrientation orientation, float pos)
 {
     float maxScrollPos = m_scrollableArea->maximumScrollPosition(orientation);
     float minScrollPos = m_scrollableArea->minimumScrollPosition(orientation);
     return std::max(std::min(pos, maxScrollPos), minScrollPos);
 }
 
 } // namespace WebCore