Change members's order and combine duplicated method for FFTFrame.

Source/platform/audio/FFTFrameStub.cpp

 /*
  * Copyright (C) 2011 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 65 matching lines @@
 
 void FFTFrame::initialize()
 {
 }
 
 void FFTFrame::cleanup()
 {
     ASSERT_NOT_REACHED();
 }
 
-float* FFTFrame::realData() const
-{
-    ASSERT_NOT_REACHED();
-    return 0;
-}
-
-float* FFTFrame::imagData() const
-{
-    ASSERT_NOT_REACHED();
-    return 0;
-}
-
 } // namespace blink
 
 #endif // !OS(MACOSX) && !USE(WEBAUDIO_FFMPEG) && !USE(WEBAUDIO_IPP) && !USE(WEBAUDIO_OPENMAX_DL_FFT)
 
 #endif // ENABLE(WEB_AUDIO)