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

Source/platform/audio/FFTFrameStub.cpp

Index: Source/platform/audio/FFTFrameStub.cpp
diff --git a/Source/platform/audio/FFTFrameStub.cpp b/Source/platform/audio/FFTFrameStub.cpp
index e12ba8c1347b24e40a275a1708e35aa79cccab87..8738a905424b0c065949496320da2c0137270ec7 100644
--- a/Source/platform/audio/FFTFrameStub.cpp
+++ b/Source/platform/audio/FFTFrameStub.cpp
@@ -83,18 +83,6 @@ 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)