Rename OS(DARWIN) to OS(MACOSX).

Source/core/platform/audio/FFTFrame.h

 /*
  * 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 13 matching lines @@
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef FFTFrame_h
 #define FFTFrame_h
 
 #include "core/platform/audio/AudioArray.h"
 
-#if OS(DARWIN) && !USE(WEBAUDIO_FFMPEG)
+#if OS(MACOSX) && !USE(WEBAUDIO_FFMPEG)
 #define USE_ACCELERATE_FFT 1
 #else
 #define USE_ACCELERATE_FFT 0
 #endif
 
 #if USE_ACCELERATE_FFT
 #include <Accelerate/Accelerate.h>
 #endif
 
 #if !USE_ACCELERATE_FFT
@@ skipping 105 matching lines @@
     AudioFloatArray m_realData;
     AudioFloatArray m_imagData;
 #endif
 
 #endif // !USE_ACCELERATE_FFT
 };
 
 } // namespace WebCore
 
 #endif // FFTFrame_h