Clean up the Config to enable 48kHz support in AudioProcessing

webrtc/modules/audio_processing/include/audio_processing.h

Index: webrtc/modules/audio_processing/include/audio_processing.h
diff --git a/webrtc/modules/audio_processing/include/audio_processing.h b/webrtc/modules/audio_processing/include/audio_processing.h
index 6fa1c96c0771c14d141836dc0c88bf69ec9f5aea..aa319da8c3819183a76ba9110ae750177b4eff50 100644
--- a/webrtc/modules/audio_processing/include/audio_processing.h
+++ b/webrtc/modules/audio_processing/include/audio_processing.h
@@ -113,15 +113,6 @@ struct Beamforming {
   const std::vector<Point> array_geometry;
 };
 
-// Use to enable 48kHz support in audio processing. Must be provided through the
-// constructor. It will have no impact if used with
-// AudioProcessing::SetExtraOptions().
-struct AudioProcessing48kHzSupport {
-  AudioProcessing48kHzSupport() : enabled(true) {}
-  explicit AudioProcessing48kHzSupport(bool enabled) : enabled(enabled) {}
-  bool enabled;
-};
-
 static const int kAudioProcMaxNativeSampleRateHz = 32000;
 
 // The Audio Processing Module (APM) provides a collection of voice processing