Rename OS(DARWIN) to OS(MACOSX).

Source/core/page/DragController.cpp

 /*
  * Copyright (C) 2007, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Google Inc.
  *
  * 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
@@ skipping 738 matching lines @@
     IntRect draggingRect = enclosingIntRect(sourceFrame->selection().bounds());
     int xpos = draggingRect.maxX();
     xpos = draggingRect.x() < xpos ? draggingRect.x() : xpos;
     int ypos = draggingRect.maxY();
     ypos = draggingRect.y() < ypos ? draggingRect.y() : ypos;
     return IntPoint(xpos, ypos);
 }
 
 static const IntSize& maxDragImageSize()
 {
-#if OS(DARWIN)
+#if OS(MACOSX)
     // Match Safari's drag image size.
     static const IntSize maxDragImageSize(400, 400);
 #else
     static const IntSize maxDragImageSize(200, 200);
 #endif
     return maxDragImageSize;
 }
 
 static PassOwnPtr<DragImage> dragImageForImage(Element* element, Image* image, const IntPoint& dragOrigin, const IntRect& imageRect, IntPoint& dragLocation)
 {
@@ skipping 152 matching lines @@
     return false;
 #endif
 }
 
 void DragController::cleanupAfterSystemDrag()
 {
 }
 
 } // namespace WebCore