Fix warnings, simplify ADM.

webrtc/modules/audio_device/audio_device_generic.h

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 146 matching lines @@
   // Android only
   virtual bool BuiltInAECIsAvailable() const;
   virtual bool BuiltInAGCIsAvailable() const;
   virtual bool BuiltInNSIsAvailable() const;
 
   // Windows Core Audio and Android only.
   virtual int32_t EnableBuiltInAEC(bool enable);
   virtual int32_t EnableBuiltInAGC(bool enable);
   virtual int32_t EnableBuiltInNS(bool enable);
 
-  // Windows Core Audio only.
-  virtual bool BuiltInAECIsEnabled() const;
-
   // iOS only.
   // TODO(henrika): add Android support.
+#if defined(WEBRTC_IOS)
   virtual int GetPlayoutAudioParameters(AudioParameters* params) const;
   virtual int GetRecordAudioParameters(AudioParameters* params) const;
+#endif  // WEBRTC_IOS
 
   virtual bool PlayoutWarning() const = 0;
   virtual bool PlayoutError() const = 0;
   virtual bool RecordingWarning() const = 0;
   virtual bool RecordingError() const = 0;
   virtual void ClearPlayoutWarning() = 0;
   virtual void ClearPlayoutError() = 0;
   virtual void ClearRecordingWarning() = 0;
   virtual void ClearRecordingError() = 0;
 
   virtual void AttachAudioBuffer(AudioDeviceBuffer* audioBuffer) = 0;
 
   virtual ~AudioDeviceGeneric() {}
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_AUDIO_DEVICE_AUDIO_DEVICE_GENERIC_H