Use FFT from FFMpeg for OSX

third_party/WebKit/Source/platform/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 import("//testing/test.gni")
 import("//third_party/WebKit/public/public_features.gni")
 import("//third_party/WebKit/Source/build/scripts/scripts.gni")
@@ skipping 450 matching lines @@
     "audio/SincResampler.h",
     "audio/StereoPanner.cpp",
     "audio/StereoPanner.h",
     "audio/UpSampler.cpp",
     "audio/UpSampler.h",
     "audio/VectorMath.cpp",
     "audio/VectorMath.h",
     "audio/android/FFTFrameOpenMAXDLAndroid.cpp",
     "audio/ffmpeg/FFTFrameFFMPEG.cpp",
     "audio/ipp/FFTFrameIPP.cpp",
-    "audio/mac/FFTFrameMac.cpp",
     "blob/BlobData.cpp",
     "blob/BlobData.h",
     "blob/BlobRegistry.cpp",
     "blob/BlobRegistry.h",
     "blob/BlobURL.cpp",
     "blob/BlobURL.h",
     "clipboard/ClipboardMimeTypes.cpp",
     "clipboard/ClipboardMimeTypes.h",
     "clipboard/ClipboardUtilities.cpp",
     "clipboard/ClipboardUtilities.h",
@@ skipping 1632 matching lines @@
     "//third_party/WebKit/Source:config",
     "//third_party/WebKit/Source:inside_blink",
   ]
 
   deps = [
     ":test_support",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }