Rename OS(DARWIN) to OS(MACOSX).

Source/core/html/HTMLSelectElement.cpp

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
@@ skipping 1274 matching lines @@
         // Calling focus() may cause us to lose our renderer, in which case do not want to handle the event.
         if (!renderer())
             return;
 
         // Convert to coords relative to the list box if needed.
         MouseEvent* mouseEvent = toMouseEvent(event);
         IntPoint localOffset = roundedIntPoint(renderer()->absoluteToLocal(mouseEvent->absoluteLocation(), UseTransforms));
         int listIndex = toRenderListBox(renderer())->listIndexAtOffset(toIntSize(localOffset));
         if (listIndex >= 0) {
             if (!isDisabledFormControl()) {
-#if OS(DARWIN)
+#if OS(MACOSX)
                 updateSelectedState(listIndex, mouseEvent->metaKey(), mouseEvent->shiftKey());
 #else
                 updateSelectedState(listIndex, mouseEvent->ctrlKey(), mouseEvent->shiftKey());
 #endif
             }
             if (Frame* frame = document().frame())
                 frame->eventHandler()->setMouseDownMayStartAutoscroll();
 
             event->setDefaultHandled();
         }
@@ skipping 267 matching lines @@
     return true;
 }
 
 bool HTMLSelectElement::anonymousIndexedSetterRemove(unsigned index, ExceptionState& es)
 {
     remove(index);
     return true;
 }
 
 } // namespace