Rename OS(DARWIN) to OS(MACOSX).

Source/core/html/shadow/SpinButtonElement.cpp

 /*
  * Copyright (C) 2006, 2008, 2010 Apple Inc. All rights reserved.
  * 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:
  * 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 212 matching lines @@
     m_repeatingTimer.stop();
 }
 
 void SpinButtonElement::step(int amount)
 {
     if (!shouldRespondToMouseEvents())
         return;
     // On Mac OS, NSStepper updates the value for the button under the mouse
     // cursor regardless of the button pressed at the beginning. So the
     // following check is not needed for Mac OS.
-#if !OS(DARWIN)
+#if !OS(MACOSX)
     if (m_upDownState != m_pressStartingState)
         return;
 #endif
     doStepAction(amount);
 }
 
 void SpinButtonElement::repeatingTimerFired(Timer<SpinButtonElement>*)
 {
     if (m_upDownState != Indeterminate)
         step(m_upDownState == Up ? 1 : -1);
 }
 
 void SpinButtonElement::setHovered(bool flag)
 {
     if (!flag)
         m_upDownState = Indeterminate;
     HTMLDivElement::setHovered(flag);
 }
 
 bool SpinButtonElement::shouldRespondToMouseEvents()
 {
     return !m_spinButtonOwner || m_spinButtonOwner->shouldSpinButtonRespondToMouseEvents();
 }
 
 }