Rename OS(DARWIN) to OS(MACOSX).

Source/web/ChromeClientImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * 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.
@@ skipping 719 matching lines @@
     m_webView->popupClosed(popupContainer);
 }
 
 void ChromeClientImpl::setCursor(const WebCore::Cursor& cursor)
 {
     setCursor(WebCursorInfo(cursor));
 }
 
 void ChromeClientImpl::setCursor(const WebCursorInfo& cursor)
 {
-#if OS(DARWIN)
+#if OS(MACOSX)
     // On Mac the mousemove event propagates to both the popup and main window.
     // If a popup is open we don't want the main window to change the cursor.
     if (m_webView->hasOpenedPopup())
         return;
 #endif
     if (m_webView->client())
         m_webView->client()->didChangeCursor(cursor);
 }
 
 void ChromeClientImpl::setCursorForPlugin(const WebCursorInfo& cursor)
@@ skipping 265 matching lines @@
 {
 }
 
 void NavigatorContentUtilsClientImpl::registerProtocolHandler(const String& scheme, const String& baseURL, const String& url, const String& title)
 {
     m_webView->client()->registerProtocolHandler(scheme, baseURL, url, title);
 }
 #endif
 
 } // namespace WebKit