Revert of Allow more than 2 input channels in AudioProcessing.

webrtc/modules/audio_processing/audio_buffer.h

Index: webrtc/modules/audio_processing/audio_buffer.h
diff --git a/webrtc/modules/audio_processing/audio_buffer.h b/webrtc/modules/audio_processing/audio_buffer.h
index 6750af08714a14312916ba88c3ae07b4c35c0ad5..4291fb3eb99832a416d691cecab9c8b8ff9a041e 100644
--- a/webrtc/modules/audio_processing/audio_buffer.h
+++ b/webrtc/modules/audio_processing/audio_buffer.h
@@ -112,8 +112,12 @@
   void InterleaveTo(AudioFrame* frame, bool data_changed) const;
 
   // Use for float deinterleaved data.
-  void CopyFrom(const float* const* data, const StreamConfig& stream_config);
-  void CopyTo(const StreamConfig& stream_config, float* const* data);
+  void CopyFrom(const float* const* data,
+                int num_frames,
+                AudioProcessing::ChannelLayout layout);
+  void CopyTo(int num_frames,
+              AudioProcessing::ChannelLayout layout,
+              float* const* data);
   void CopyLowPassToReference();
 
   // Splits the signal into different bands.