Fix warnings, simplify ADM.

webrtc/modules/audio_device/audio_device_generic.cc

 /*
  *  Copyright (c) 2011 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 39 matching lines @@
 bool AudioDeviceGeneric::BuiltInAECIsAvailable() const {
   LOG_F(LS_ERROR) << "Not supported on this platform";
   return false;
 }
 
 int32_t AudioDeviceGeneric::EnableBuiltInAEC(bool enable) {
   LOG_F(LS_ERROR) << "Not supported on this platform";
   return -1;
 }
 
-bool AudioDeviceGeneric::BuiltInAECIsEnabled() const {
-  LOG_F(LS_ERROR) << "Not supported on this platform";
-  return false;
-}
-
 bool AudioDeviceGeneric::BuiltInAGCIsAvailable() const {
   LOG_F(LS_ERROR) << "Not supported on this platform";
   return false;
 }
 
 int32_t AudioDeviceGeneric::EnableBuiltInAGC(bool enable) {
   LOG_F(LS_ERROR) << "Not supported on this platform";
   return -1;
 }
 
 bool AudioDeviceGeneric::BuiltInNSIsAvailable() const {
   LOG_F(LS_ERROR) << "Not supported on this platform";
   return false;
 }
 
 int32_t AudioDeviceGeneric::EnableBuiltInNS(bool enable) {
   LOG_F(LS_ERROR) << "Not supported on this platform";
   return -1;
 }
 
+#if defined(WEBRTC_IOS)
 int AudioDeviceGeneric::GetPlayoutAudioParameters(
     AudioParameters* params) const {
   LOG_F(LS_ERROR) << "Not supported on this platform";
   return -1;
 }
+
 int AudioDeviceGeneric::GetRecordAudioParameters(
     AudioParameters* params) const {
   LOG_F(LS_ERROR) << "Not supported on this platform";
   return -1;
 }
+#endif  // WEBRTC_IOS
 
 }  // namespace webrtc